How to fire the button event in gridview created dynamically

How to fire the button event in gridview created dynamically - c#

I've a gridview with webcontrols(Textbox,Button in footer). Dynamically I need to create any number of gridviews by the following code. But only 1 gridview is created. And also the problem is the button event is not firing
public void btn_Click(object sender, EventArgs e)
{
GridView gv = new GridView();
gv.ID = sender.ToString();
}
inside the class. How to fire this event?
This is the code I used to create gridview.
protected void btnAddGrid_Click(object sender,EventArgs e)
{
int count = Convert.ToInt32(Session["count"]);
DataTable dt=(DataTable)ViewState["CurrentTableforCommonDetails"];
GridView gv = new GridView();
gv.ID = "GridView" + count;
gv.AutoGenerateColumns = false;
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Columns.Count; i++)
{
TemplateField tmpfld = new TemplateField();
tmpfld.HeaderText = dt.Columns[i].ColumnName.ToString();
tmpfld.ItemTemplate =new DynamicTemplateField();
if (i == 0)
{
tmpfld.FooterTemplate = new DynamicTemplateField1();
}
gv.Columns.Add(tmpfld);
}
}
gv.Visible = true;
gv.ShowHeaderWhenEmpty = true;
gv.ShowFooter = true;
placegridview.Controls.Add(gv);
gv.DataSource = dt;
gv.DataBind();
count++;
Session["count"] = count;
}
public class DynamicTemplateField : ITemplate
{
public void InstantiateIn(System.Web.UI.Control container)
{
//define the control to be added , i take text box as your need
System.Web.UI.WebControls.TextBox txt1 = new System.Web.UI.WebControls.TextBox();
txt1.ID = "txt1";
txt1.Width = 50;
container.Controls.Add(txt1);
}
}
public class DynamicTemplateField1 : ITemplate
{
public void InstantiateIn(System.Web.UI.Control container)
{
//define the control to be added , i take text box as your need
System.Web.UI.WebControls.Button btn = new System.Web.UI.WebControls.Button();
btn.ID = "btn1";
btn.Click += new EventHandler(btn_Click);
btn.UseSubmitBehavior = false;
btn.Text = "Add New";
container.Controls.Add(btn);
}
public void btn_Click(object sender, EventArgs e)
{
GridView gv = new GridView();
gv.ID = sender.ToString();
}
}

This generally involves tracking (or maintaining state which stores) the fact that you have a dynamic control, and adding that control to the control tree really early on in the page lifecycle. The following example is not relevant to your question, but it demonstrates how to deal with dynamic controls
using System;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApp.DynamicControls2
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ControlsCount = 0;
}
else
{
for (int i = 0, j = ControlsCount; i < j; i++)
{
CreateControl();
}
}
}
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
}
int ControlsCount
{
get
{
if (ViewState["ControlsCount"] == null)
{
int count = 0;
ViewState["ControlsCount"] = count;
return count;
}
return (int)ViewState["ControlsCount"];
}
set
{
ViewState["ControlsCount"] = value;
}
}
protected void btnAdd_Click(object sender, EventArgs e)
{
CreateControl(true);
}
protected void btnCount_Click(object sender, EventArgs e)
{
}
void CreateControl(bool UpdateCount = false)
{
TextBox tbx = new TextBox();
Button btn = new Button() { Text = "Get Time" };
btn.Click += btn_Click;
Literal br = new Literal() { Text = "<br/>" };
var ctls = phContainer.Controls;
ctls.Add(tbx);
ctls.Add(btn);
ctls.Add(br);
if (UpdateCount) ControlsCount++;
}
void btn_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
Control parent = btn.Parent;
int index = parent.Controls.IndexOf(btn);
TextBox tbx = parent.Controls[index - 1] as TextBox;
tbx.Text = DateTime.Now.ToLongTimeString();
}
}
}
The webform associated with this code is:
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApp.DynamicControls2.WebForm1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Dynamic Controls</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button ID="btnAdd" runat="server" Text="Add" OnClick="btnAdd_Click" />
<asp:Button ID="btnCount" runat="server" Text="Get Count" OnClick="btnCount_Click" />
</div>
<br />
<br />
<div>
<asp:PlaceHolder ID="phContainer" runat="server"></asp:PlaceHolder>
</div>
</form>
</body>
</html>
You should adapt your code likewise to ensure this effect.
If you want to understand terms such as tracking or control tree read the following article series. http://weblogs.asp.net/infinitiesloop/TRULY-Understanding-Dynamic-Controls-_2800_Part-1_2900_
Update 1:
There are various cases and it can become complicated based on requirement. The code for the most basic approach is shown below:
Webform (aspx):
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm3.aspx.cs" Inherits="WebApp.DynamicGridViewWithTemplateField.WebForm3" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
<asp:Button ID="btn1" runat="server" Text="Clickme" />
</div>
</form>
</body>
</html>
Code-behind:
using System;
using System.Collections.Generic;
using System.Data;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApp.DynamicGridViewWithTemplateField
{
public partial class WebForm3 : System.Web.UI.Page
{
protected override void LoadViewState(object savedState)
{
base.LoadViewState(savedState);
CreateGrid();
}
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (!IsPostBack)
{
CreateGrid();
ViewState["foo"] = "foo"; //forcing viewstate
}
}
}
private static DataTable GetNames()
{
DataTable tbl = new DataTable();
tbl.Columns.Add(new DataColumn("Name"));
List<string> names = new List<string>() { "Arun", "Samit", "Jermy", "John" };
names.ForEach(x =>
{
var row = tbl.NewRow();
row[0] = x;
tbl.Rows.Add(row);
});
return tbl;
}
void CreateGrid()
{
GridView gv = new GridView();
gv.AutoGenerateColumns = false;
gv.Columns.Add(new BoundField() {
HeaderText="Names",
DataField="Name"
});
gv.Columns.Add(new TemplateField()
{
ItemTemplate = new TextTemplateField(),
HeaderText = "Remarks"
});
gv.Columns.Add(new TemplateField()
{
ItemTemplate = new DropDownTemplateField(),
HeaderText="Choose option"
});
gv.Columns.Add(new TemplateField()
{
ItemTemplate = new ButtonTemplateField()
});
gv.RowCommand += (sndr, evt) =>
{
if (evt.CommandName == "foo")
{
Control ctrl = (Control)evt.CommandSource;
GridViewRow gvRow = (GridViewRow)ctrl.Parent.Parent;
var tbx = gvRow.FindControl("tbx1") as TextBox;
tbx.Text = DateTime.Now.ToLongTimeString();
}
};
gv.DataSource = GetNames();
gv.DataBind();
PlaceHolder1.Controls.Add(gv);
}
}
}
The ButtonTemplateField, DropDownTemplateField and TextTemplateField are simple templates, and correspondingly contain a Button, DropDownList, and TextBox respectively. Nothing really fancy there.
public class DropDownTemplateField : ITemplate
{
int[] options = new int[] { 1, 2, 3, 4 };
public void InstantiateIn(Control container)
{
DropDownList ddl = new DropDownList();
ddl.DataSource = options;
foreach (int value in options)
{
ddl.Items.Add(new ListItem(value.ToString(), value.ToString()));
}
container.Controls.Add(ddl);
}
}
public class ButtonTemplateField : ITemplate
{
public void InstantiateIn(Control container)
{
Button btn = new Button();
btn.CommandName = "foo";
btn.Text = "Click me";
container.Controls.Add(btn);
}
}
public class TextTemplateField : ITemplate
{
public void InstantiateIn(Control container)
{
TextBox tbx = new TextBox();
tbx.ID = "tbx1";
container.Controls.Add(tbx);
}
}

Related

asp table returning 0 rows on save

I have a form with a table, a cancel button and a save button. The last column in the table is editable. The save button saves the edits to the last column. The problem I am having is when I save, the table posts back as having 0 rows in the SaveButton_ServerClick method.
HTML:
<%# Page validateRequest="false" Language="C#" AutoEventWireup="true" CodeBehind="xxxxxx.aspx.cs" Inherits="xxxxx.xxx" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="Form1" runat="server">
<asp:Table id="SettingsTable" runat="server" EnableViewState="true"></asp:Table>
<asp:Button id="CancelButton" runat="server" Text="Cancel"></asp:Button>
<asp:Button id="SaveButton" runat="server" Text="Save"></asp:Button>
</form>
</body>
</html>
C#:
const string CONFIG_SET_ID = "ConfigurationSetId";
const string CONFIG_SET_NAME = "ConfigurationSetName";
const string CONFIG_SET_DESC = "ConfigurationSetDescription";
const string APP_NAME = "AppName";
const string APP_ID = "AppId";
const string SET_CAT = "SettingCategory";
const string SET_DESC = "SettingDescription";
const string SET_CAT_ID = "SettingCategoryId";
const string TITLE = "title";
const int CONFIG_SET_CELL = 0;
const int APP_NAME_CELL = 1;
const int SET_CAT_CELL = 2;
const int SETTINGKEY_CELL = 3;
const int SETTINGVALUE_CELL = 4;
static Dictionary<string, ConfigurationDictionary> _cfgDics = new Dictionary<string, ConfigurationDictionary>();
protected void Page_Load(object sender, EventArgs e)
{
AppCfg.AppName = "xxxxx";
AppCfg.Initialize();
if (!Page.IsPostBack)
LoadSettings();
SaveButton.Click += SaveButton_ServerClick;
CancelButton.Click += CancelButton_ServerClick;
}
/// ADDING THIS FIXED THE POSTBACK PROBLEM.
void CancelButton_ServerClick(object sender, EventArgs e)
{
LoadSettings();
}
void SaveButton_ServerClick(object sender, EventArgs e)
{
foreach (TableRow row in SettingsTable.Rows)
{
if (row.Cells[SETTINGVALUE_CELL].Controls[0].GetType().Equals(typeof(TextBox)))
{
string appId = row.Cells[APP_NAME_CELL].Attributes[APP_ID];
string settingKey = row.Cells[SETTINGKEY_CELL].Text;
string settingValue = ((TextBox)row.Cells[SETTINGVALUE_CELL].Controls[0]).Text;
if (_cfgDics.ContainsKey(appId) && _cfgDics[appId][settingKey].Value != settingValue)
_cfgDics[appId][settingKey] = settingValue;
}
}
System.Threading.Thread.Sleep(1000);
LoadSettings();
}
void CancelButton_ServerClick(object sender, EventArgs e)
{
LoadSettings();
}
private void LoadSettings()
{
//foreach (ConfigurationDictionary dic in _cfgDics.Values)
// dic.Dispose();
//_cfgDics.Clear();
SettingsTable.Rows.Clear();
// Build Settings table
// Build Header row
TableRow headerRow = new TableRow();
headerRow.Cells.Add(new TableCell() { Text = "Config Set" });
headerRow.Cells.Add(new TableCell() { Text = "Application" });
headerRow.Cells.Add(new TableCell() { Text = "Category" });
headerRow.Cells.Add(new TableCell() { Text = "Setting Key" });
headerRow.Cells.Add(new TableCell() { Text = "Setting Value" });
SettingsTable.Rows.Add(headerRow);
IniFileEditor xxxIni = new IniFileEditor();
string dbConnString = xxxIni.ReadValue(ConfigurationDictionary.SECKEY, ConfigurationDictionary.SETTING_DB_KEY);
if (!string.IsNullOrEmpty(dbConnString))
{
// Build each setting
using (DatabaseAccess dba = new DatabaseAccess(dbConnString))
using (SqlCommand cmd = new SqlCommand("Select * from AllSettings"))
using (SqlDataReader reader = dba.GetSqlReader(cmd))
{
while (reader.Read())
{
TableRow row = new TableRow();
string appId = string.Empty;
row.Cells.Add(new TableCell() { Text = reader[CONFIG_SET_NAME].ToString() });
row.Cells[CONFIG_SET_CELL].Attributes[CONFIG_SET_ID] = reader[CONFIG_SET_ID].ToString();
row.Cells[CONFIG_SET_CELL].Attributes[TITLE] = reader[CONFIG_SET_DESC].ToString();
row.Cells.Add(new TableCell() { Text = reader[APP_NAME].ToString() });
appId = reader[APP_ID].ToString();
row.Cells[APP_NAME_CELL].Attributes[APP_ID] = appId;
row.Cells[APP_NAME_CELL].Attributes[TITLE] = string.Format("AppId:\t{0} \r\nMachine:\t{1} \r\nIPAddress:\t{2}",
reader[APP_ID],
reader["MachineName"],
reader["MachineAddress"]);
row.Cells.Add(new TableCell() { Text = reader[SET_CAT].ToString() });
row.Cells[SET_CAT_CELL].Attributes[SET_CAT_ID] = reader[SET_CAT_ID].ToString();
row.Cells.Add(new TableCell() { Text = reader["SettingKey"].ToString() });
row.Cells[SETTINGKEY_CELL].Attributes[TITLE] = reader[SET_DESC].ToString();
TextBox valueTextbox = new TextBox();
valueTextbox.Text = reader["SettingValue"].ToString();
row.Cells.Add(new TableCell());
row.Cells[SETTINGVALUE_CELL].Controls.Add(valueTextbox);
if (!_cfgDics.ContainsKey(appId))
_cfgDics.Add(appId, new ConfigurationDictionary(appId));
SettingsTable.Rows.Add(row);
}
}
}
}

Try creating the dynamic controls every time in the PreInit event, that is the only way ViewState will ever get applied on Post-Back.
protected void Page_PreInit(object sender, EventArgs e)
{
LoadSettings();
}

Upon post back the table data been lost. so please keep the table data in the sessionstate or viewstate.

Database Records on Page Load - Dynamic Text Fields

I am working with dynamically created text fields. Most solutions I have found thus far have been related to retaining view state on postback, but I believe I have taken care of that issue. On postback, the values that are in the text fields are retained.
The issue I am having: I can't get the database values currently stored to load in the dynamic fields. I am currently calling loadUpdates() to try to do this, but unsure how to grab the data row, while also making sure I can continue to add new fields (or remove them). How can I achieve this?
"txtProjectsUpdate" is the text field, "hidFKID" is the foreign key to a parent table, and "hidUpdateID" is the hidden value of the primary key in the child table (the values I am attempting to load).
Markup:
<div>
<asp:Button ID="btnAddTextBox" runat="server" Text="Add" OnClick="btnAddTextBox_Click" />
<asp:Placeholder ID="placeHolderControls" runat="server"/>
</div>
<asp:TextBox runat = "server" ID = "hidUpdateID" />
<asp:HiddenField runat = "server" ID = "hidFKID" />
Code behind:
protected void Page_Load(object sender, EventArgs e)
{
if (Page.IsPostBack)
{
for (var i = 0; i < TextBoxCount; i++)
AddTextBox(i);
}
if (!IsPostBack)
{
DataTable dt = new DataTable();
dt = selectDetails();
tryHidFKID(hidFKID, dt.Rows[0]["fkprjNumber"].ToString());
loadUpdates();
}
}
protected void btnAddTextBox_Click(object sender, EventArgs e)
{
AddTextBox(TextBoxCount);
TextBoxCount++;
}
private int TextBoxCount
{
get
{
var count = ViewState["txtBoxCount"];
return (count == null) ? 0 : (int)count;
}
set { ViewState["txtBoxCount"] = value; }
}
private void btnRemove_Click(object sender, EventArgs e)
{
var btnRemove = sender as Button;
if (btnRemove == null) return;
btnRemove.Parent.Visible = false;
}
private void AddTextBox(int index)
{
var panel = new Panel();
panel.Controls.Add(new TextBox
{
ID = string.Concat("txtProjectUpdates", index),
Rows = 5,
Columns = 130,
TextMode = TextBoxMode.MultiLine,
CssClass = "form-control",
MaxLength = 500
});
panel.Controls.Add(new TextBox
{
ID = string.Concat("hidUpdateID", index)
});
var btn = new Button { Text = "Remove" };
btn.Click += btnRemove_Click;
panel.Controls.Add(btn);
placeHolderControls.Controls.Add(panel);
}
protected void loadUpdates()
{
DataTable dt = dbClass.ExecuteDataTable
(
"spSelectRecords", <db>, new SqlParameter[1]
{
new SqlParameter ("#vFKPrjNumber", hidFKID.Value)
}
);
AddTextBox(TextBoxCount);
TextBoxCount++;
}
protected void tryHidFKID(HiddenField hidFKID, string txtSelected)
{
try
{
hidFKID.Value = txtSelected;
}
catch
{
hidFKID.Value = "";
}
}

How Can I retrieve data from TextBox, when it's dynamically added by button?

I'm new to coding, hope some can help me a bit, I got stuck at retrieving data from my Dynamically added Text boxes in ASP.NET.
I Master Site and a Content site. I have added some buttons to the content site there are adding or removing the textboxes, after what's needed by the user.
My problem is, that i'm not sure how to retrieve the data correct. hope some body can help me on the way.
My Content site:
<%# Page Title="" Language="C#" MasterPageFile="~/main.master" AutoEventWireup="true" CodeFile="CreateRMA.aspx.cs" Inherits="CreateRMA" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="mainsite" Runat="Server">
<div id="div_fortext" class="div_fortext">
<p class="header2">
Opret RMA Sag
</p>
<p class="text1">
Her Kan de oprette alt det udstyr der skal sendes til reperation hos zenitel.
</p>
</div>
<div id="div_insert_devices" runat="server">
</div>
// 3 buttons one who add, one who remove textboxes and a submit button
<asp:Button ID="btnAddRow" runat="server" Text="Add Row" CssClass="butten1" OnClick="btnAddRow_Click" />
<asp:Button ID="btnRemoveRow" runat="server" Text="Remove Row" CssClass="butten1" OnClick="btnRemoveRow_Click" />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" CssClass="butten1" OnClick="btnSubmit_Click" />
</asp:Content>
My C# code behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class CreateRMA : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
ViewState["DeviceCount"] = ViewState["DeviceCount"] == null ? 1 : ViewState["DeviceCount"];
InsertLine();
}
}
private void InsertLine()
{
int DeviceCount = int.Parse(ViewState["DeviceCount"].ToString());
for (int i = 0; i < DeviceCount; i++)
{
LiteralControl text = new LiteralControl("<div class=\"divPerDevice\">");
div_insert_devices.Controls.Add(text);
TextBox txtbox = new TextBox();
txtbox.ID = "serial" + i;
txtbox.CssClass = "textbox1";
txtbox.Attributes.Add("runat", "Server");
div_insert_devices.Controls.Add(txtbox);
text = new LiteralControl("</div>");
div_insert_devices.Controls.Add(text);
}
}
protected void btnAddRow_Click(object sender, EventArgs e)
{
int count = int.Parse(ViewState["DeviceCount"].ToString());
count++;
ViewState["DeviceCount"] = count;
InsertLine();
}
protected void btnRemoveRow_Click(object sender, EventArgs e)
{
int count = int.Parse(ViewState["DeviceCount"].ToString());
count--;
ViewState["DeviceCount"] = count;
InsertLine();
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
// Submit - save the textboxes to Strings ??? Can any body help
}
}

((TextBox)div_insert_devices.FindControl("txtboxname")).Text
Try this one

you can use the following code
protected void btnSubmit_Click(object sender, EventArgs e)
{
// Submit - save the textboxes to Strings ??? Can any body help
int DeviceCount = int.Parse(ViewState["DeviceCount"].ToString());
for (int i = 0; i < DeviceCount; i++)
{
TextBox txtbx= (TextBox)div_insert_devices.FindControl("serial" + i);
if(txtbx!=null)
{
var value= txtbx.Text;
}
}
}

The way i would attempt this is like the following:
protected void btnSubmit_Click(object sender, EventArgs e)
{
foreach (Control control in div_insert_devices.Controls){
if (control.GetType() == typeof(textbox)){
Textbox myDynTextbox = (Textbox)control;
Var myString = myDynTextbox.Text;
Please note this code can be simplyfied further but, i have written it this was so you understand how it would work, and my advise would be to store all the strings in a collection of Strings, making it easier to maintain.
}
}
}
Kush

Why don't you use javascript to save the value of textbox. just hold the value in some hidden field and bind it everytime when you need it.

Hi I found the solution after some time here... I did not got any of examples to work that you have provided. sorry.
But I almost started from scratch and got this to work precis as I wanted :)
My Content Site:
<%# Page Title="" Language="C#" MasterPageFile="~/main.master" AutoEventWireup="true" CodeFile="CreateRMA.aspx.cs" Inherits="CreateRMA" %>
<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="mainsite" Runat="Server">
<div id="div_fortext" class="div_fortext">
<p class="header2">
Opret RMA Sag
</p>
<p class="text1">
Some TEXT
</p>
</div>
</div>
<asp:Button ID="btnAddRow" runat="server" Text="Add Row" CssClass="butten1" OnClick="btnAddRow_Click" />
<asp:Button ID="btnRemoveRow" runat="server" Text="Remove Row" CssClass="butten1" OnClick="btnRemoveRow_Click" />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" CssClass="butten1" OnClick="btnSubmit_Click" />--%>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
<asp:PlaceHolder runat="server" id="DynamicDevices"></asp:PlaceHolder>
<asp:Button id="btnAddTextBox" runat="server" text="Tilføj" CssClass="butten1" OnClick="btnAddTextBox_Click" />
<asp:Button id="btnRemoveTextBox" runat="server" text="Fjern" CssClass="butten1" OnClick="btnRemoveTextBox_Click" />
<asp:Button runat="server" id="Submit" text="Submit" CssClass="butten1" OnClick="Submit_Click" />
<br /><asp:Label runat="server" id="MyLabel"></asp:Label>
</asp:Content>
My C# code behind:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Data;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class CreateRMA : System.Web.UI.Page
{
static int myCount = 1;
private TextBox[] dynamicTextBoxes;
private TextBox[] Serial_arr;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
myCount = 1;
}
}
protected void Page_Init(object sender, EventArgs e)
{
Control myControl = GetPostBackControl(this.Page);
if (myControl != null)
{
if (myControl.ID.ToString() == "btnAddTextBox")
{
myCount = myCount >= 30 ? 30 : myCount + 1;
}
if (myControl.ID.ToString() == "btnRemoveTextBox")
{
myCount = myCount <= 1 ? 1 : myCount - 1;
}
}
}
protected override void OnInit(EventArgs e)
{
base.OnInit(e);
dynamicTextBoxes = new TextBox[myCount];
Serial_arr = new TextBox[myCount];
int i;
for (i = 0; i < myCount; i += 1)
{
LiteralControl literalBreak = new LiteralControl("<div>");
DynamicDevices.Controls.Add(literalBreak);
TextBox Serial = new TextBox();
Serial.ID = "txtSerial" + i.ToString();
Serial.CssClass = "";
DynamicDevices.Controls.Add(Serial);
Serial_arr[i] = Serial;
TextBox textBox = new TextBox();
textBox.ID = "myTextBox" + i.ToString();
DynamicDevices.Controls.Add(textBox);
dynamicTextBoxes[i] = textBox;
literalBreak = new LiteralControl("</div>");
DynamicDevices.Controls.Add(literalBreak);
}
}
public static Control GetPostBackControl(Page thePage)
{
Control mycontrol = null;
string ctrlname = thePage.Request.Params.Get("_EVENTTARGET");
if (((ctrlname != null) & (ctrlname != string.Empty)))
{
mycontrol = thePage.FindControl(ctrlname);
}
else
{
foreach (string item in thePage.Request.Form)
{
Control c = thePage.FindControl(item);
if (((c) is System.Web.UI.WebControls.Button))
{
mycontrol = c;
}
}
}
return mycontrol;
}
protected void Submit_Click(object sender, EventArgs e)
{
int deviceCount = Serial_arr.Count();
DataSet ds = new DataSet();
ds.Tables.Add("Devices");
ds.Tables["Devices"].Columns.Add("Serial", System.Type.GetType("System.String"));
ds.Tables["Devices"].Columns.Add("text", System.Type.GetType("System.String"));
for (int x = 0; x < deviceCount; x++)
{
DataRow dr = ds.Tables["Devices"].NewRow();
dr["Serial"] = Serial_arr[x].Text.ToString();
dr["text"] = dynamicTextBoxes[x].Text.ToString();
ds.Tables["Devices"].Rows.Add(dr);
}
//MyLabel.Text = "der er " + deviceCount +" Devices<br />";
//foreach (TextBox tb in Serial_arr)
//{
// MyLabel.Text += tb.Text + " :: ";
//}
//MyLabel.Text += "<br />";
//foreach (TextBox tb in dynamicTextBoxes)
//{
// MyLabel.Text += tb.Text + " :: ";
//}
}
protected void btnAddTextBox_Click(object sender, EventArgs e)
{
}
protected void btnRemoveTextBox_Click(object sender, EventArgs e)
{
}
}
Thanks For all the help anyway :)
Hope somebody can use this.
Best regards Kasper :)

Lost Component After choice SelectIndexChanged at GridView

When I choice row at GridView of UserControl.This gridview disappear.
Main page (aspx page)
1.1.Html
<body>
<form id="form1" runat="server">
<div>
<asp:PlaceHolder ID="plh" runat="server"></asp:PlaceHolder>
</div>
</form>
</body>
1.2.CodeBehind
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
Test2.Admin.WebUserControl1[] wuc = new Test2.Admin.WebUserControl1[2];
for (int i = 0; i < 2; i++)
{
plh.Controls.Add(new LiteralControl("<div id='dvChannel' runat='server' style='width: 200px;float:left;padding-left:20px;'>"));
wuc[i] = (Test2.Admin.WebUserControl1)LoadControl("WebUserControl1.ascx");
wuc[i].ID = "wuc" + i.ToString();
plh.Controls.Add(wuc[i]);
plh.Controls.Add(new LiteralControl("</div>"));
}
}
}
UserControl
2.1.html
<%# Control Language="C#" AutoEventWireup="true" CodeBehind="WebUserControl1.ascx.cs" Inherits="Test2.Admin.WebUserControl1" %>
<asp:GridView ID="GridView1" runat="server" AutoGenerateSelectButton="true"
OnSelectedIndexChanged="gvSelected">
</asp:GridView>
2.2.Codebehind
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
var list = (new[] {
new { Price = 30 } ,
new { Price = 30 },
new { Price = 30 },
new { Price = 30 }
});
GridView1.DataSource = list;
GridView1.DataBind();
}
}
protected void gvSelected(object sender,EventArgs e)
{
GridViewRow row = GridView1.Rows[GridView1.SelectedIndex];
row.BackColor = Color.Red;//Set red color for this row on gridview
}
When I choice row at GridView of UserControl.This gridview disappear.
What should I do for getting it work correct.
Do you have any solution?

You need to Load the GridView even in Postbacks.
Try removing the condition - if (!Page.IsPostBack)
Or, write a different code snippet in else block - for setting the datasource & binding the Grid.

Problems with events in Asp.net

I am completly new in asp.net and I'm having some problems with it.
I created litle web form for demo and learning and I have some problems with it. Hopefuly you can help me :)
What I want is that:
when I click on "Kill X" button in table, I get "You pressed button Kill X" message in label "lblMsg". I Also want that I get table with new data.
when I click "Load" button, I need to get additional rows in the table. For example now when page loads there is 10 rows in table and when I click "Load" I nedd to get additional 10 rows at the end into the same table.
P.S:
I would be grateful for some tutorial how to deal with events in asp.net.
Bellow is the code:
WebForm1.aspx
<%# Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="HelpdeskOsControl.WebForm1" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<asp:Panel ID="Panel1" runat="server" Height="465px" Width="417px">
<asp:Table ID="Processes" runat="server" Height="20px" Width="400px" CssClass="tablesorter">
<asp:TableHeaderRow ID="ProcessesHeader" runat="server"
TableSection="TableHeader">
<asp:TableHeaderCell ID="TableHeaderCell1" runat="server">Name</asp:TableHeaderCell>
<asp:TableHeaderCell ID="TableHeaderCell2" runat="server">CPU</asp:TableHeaderCell>
<asp:TableHeaderCell ID="TableHeaderCell3" runat="server">Memory</asp:TableHeaderCell>
<asp:TableHeaderCell ID="TableHeaderCell4" runat="server"></asp:TableHeaderCell>
</asp:TableHeaderRow>
</asp:Table>
<asp:Panel ID="Panel2" runat="server">
<asp:Button ID="btnLoad" runat="server" onclick="btnLoad_Click" Text="Load" />
<asp:Button ID="btnClear" runat="server" onclick="btnClear_Click"
Text="Clear" />
<asp:Label ID="lblMsg" runat="server" Text="Label"></asp:Label>
</asp:Panel>
</asp:Panel>
</form>
</body>
</html>
WebForm1.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace HelpdeskOsControl
{
public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
GenerateTable(getTestData());
}
private List<string> getTestData()
{
List<string> tData = new List<string>();
Random rand = new Random();
for (int i = 0; i < 10; i++)
{
tData.Add("proc" + i + "_" + rand.Next(100) + "_" + rand.Next(100));
}
return tData;
}
protected void btnClear_Click(object sender, EventArgs e)
{
for (int i = Processes.Rows.Count; i > 1; i--)
{
Processes.Rows.RemoveAt(i - 1);
}
}
protected void btnLoad_Click(object sender, EventArgs e)
{
GenerateTable(getTestData());
}
protected void btnKill_Click(object sender, EventArgs e)
{
lblMsg.Text = "You pressed button " + ((Button)sender).Text;
}
private void GenerateTable(List<string> list)
{
int st = 0;
foreach (string line in list)
{
TableRow tr = new TableRow();
Processes.Controls.Add(tr);
foreach (String str in line.Split('_'))
{
int index = tr.Cells.Add(new TableCell());
tr.Cells[index].Text = str;
}
Button b = new Button();
b.Text = "Kill " + st;
b.ID = "btnKill_" + st;
b.Click += new EventHandler(btnKill_Click);
TableCell tc = new TableCell();
tc.Controls.Add(b);
tr.Cells.Add(tc);
tr.TableSection = TableRowSection.TableBody;
st++;
}
Processes.BorderStyle = BorderStyle.Solid;
Processes.GridLines = GridLines.Both;
Processes.BorderWidth = 2;
}
}
}-

I understand this is your first time with ASP.NET and want to help you learn more about its potentials.
First of all, I would replace the code you wrote with data binding, which is a way to easily build tables without having to write methods like your generateTable. ASP.NET takes care of building the table by itself. It will take me a while to illustrate you full code for achieving this, but I hope you can grab the documentation and start learning with my help.
The key control is GridView. It can be populated using a two-lines code fragment
protected override OnLoad(EventArgs e)
{
if (!IsPostback) DataBind();
}
protected override void OnDataBind(EventArgs e)
{
gridView.DataSource = getTestData();
gridView.DataBind();
}
You must first configure columns in layout. The articles about GridView deal with this, and you can add a button for each row.
Now,
you can set the buttons as command buttons, thus not only raising the Click event, but, more important, the Command event which takes a name and an argument. That's where you can inject your code. For example
<asp:Button id="btnSomething" CommandArgument="[procId]" CommandName="kill" OnCommand="myCommandHandler" />
protected void myCommandHandler(object sender, CommandEventArgs e)
{
if (e.CommandName=="kill")
{
killProcess(e.CommandArgument);
DataBind(); //MOST IMPORTANT
}
}
Hope to have been of help. I wrote this code by hand, so please understand me if it will not work immediately

You need to store the state of the table between page loads and regenerate it as the dynamic controls are not stored between requests. (An advantage of using a ListView, DataGrid etc.).
public partial class WebForm1 : System.Web.UI.Page
{
private List<string> CurrentTestData
{
get
{
if (ViewState["CurrentTestData"] == null)
return new List<string>();
else
return (List<string>)ViewState["CurrentTestData"];
}
set
{
ViewState["CurrentTestData"] = value;
}
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
CurrentTestData = getTestData();
GenerateTable(CurrentTestData);
}
else
GenerateTable(CurrentTestData);
}
private List<string> getTestData()
{
List<string> tData = new List<string>();
Random rand = new Random();
for (int i = 0; i < 10; i++)
{
tData.Add("proc" + (CurrentTestData.Count + i) + "_" + rand.Next(100) + "_" + rand.Next(100));
}
return tData;
}
protected void btnClear_Click(object sender, EventArgs e)
{
ClearTheTable();
CurrentTestData = null;
}
protected void btnLoad_Click(object sender, EventArgs e)
{
var CombinedTestData = CurrentTestData;
CombinedTestData.AddRange(getTestData());
CurrentTestData = CombinedTestData;
GenerateTable(CurrentTestData);
}
protected void btnKill_Click(object sender, EventArgs e)
{
lblMsg.Text = "You pressed button " + ((Button)sender).Text;
}
private void GenerateTable(List<string> list)
{
ClearTheTable();
int st = 0;
foreach (string line in list)
{
TableRow tr = new TableRow();
Processes.Controls.Add(tr);
foreach (String str in line.Split('_'))
{
int index = tr.Cells.Add(new TableCell());
tr.Cells[index].Text = str;
}
Button b = new Button();
b.Text = "Kill " + st;
b.ID = "btnKill_" + st;
b.Click += new EventHandler(btnKill_Click);
TableCell tc = new TableCell();
tc.Controls.Add(b);
tr.Cells.Add(tc);
tr.TableSection = TableRowSection.TableBody;
st++;
}
Processes.BorderStyle = BorderStyle.Solid;
Processes.GridLines = GridLines.Both;
Processes.BorderWidth = 2;
}
private void ClearTheTable()
{
for (int i = Processes.Rows.Count; i > 1; i--)
{
Processes.Rows.RemoveAt(i - 1);
}
}
}

Two nice links for you:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.button.click.aspx
http://www.youcanlearnseries.com/Programming%20Tips/CSharp/SetEvents.aspx

Develop Reference

C# (C-Sharp) is a programming language developed by Microsoft that runs on the .NET Framework.

How to fire the button event in gridview created dynamically - c#

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