Develop Reference

How can I bind AutoCompleteExtender to dynamically created control?

The autofill works for the static text box, but not the dynamic one.
User needs to be able to add as many rows as necessary, and each text box should pull from the same table. There are too many records in the table to use a simple drop down... Any ideas?
This Works
<form id="TestForm" runat="server">
<asp:ScriptManager ID="thisNameDoesntMatter" runat="server"
EnablePageMethods="true" />
<asp:TextBox ID="noteValue" runat="server" OnTextChanged="noteValue_TextChanged" CausesValidation="true" Width="1000"></asp:TextBox>
<cc1:AutoCompleteExtender ServiceMethod="searchNoteValues"
MinimumPrefixLength="2"
CompletionInterval="100" EnableCaching="false" CompletionSetCount="10"
TargetControlID="noteValue"
ID="AutoCompleteExtenderNoteValues" runat="server" FirstRowSelected="false"/>
</form>
[System.Web.Script.Services.ScriptMethod()]
[System.Web.Services.WebMethod]
public static List<string> searchNoteValues(string prefixText, int count)
{
string strConn = db_connection_string_EINSTEIN;
SqlConnection con = new SqlConnection(strConn);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT id, NoteValue FROM agl.GuidelineNoteValues where isActive = 1 and NoteValue like '%' + #SearchText + '%'";
cmd.Parameters.AddWithValue("#SearchText", prefixText);
con.Open();
List<string> NoteValues = new List<string>();
using (SqlDataReader sdr = cmd.ExecuteReader())
{
while (sdr.Read())
{
NoteValues.Add(sdr["NoteValue"].ToString());
}
}
con.Close();
return NoteValues;
}
This Does Not
<form id="TestForm" runat="server">
<asp:ScriptManager ID="thisNameDoesntMatter" runat="server"
EnablePageMethods="true" />
<asp:PlaceHolder ID="TestPlaceHolder" runat="server" />
<asp:LinkButton ID="TestAddNoteButton" runat="server" Text="Add a note" OnClick="TestAddNoteButton_Click" CausesValidation="false" AutoPostBack="true"/>
</div>
</form>
Table notesTable = new Table();
protected void Page_PreRender(object sender, EventArgs e)
{
Session["table"] = notesTable;
}
public void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
notesTable.ID = "MyTable";
}
else
{
notesTable = (Table)Session["table"];
TestPlaceHolder.Controls.Add(notesTable);
}
}
protected void TestAddNoteButton_Click(object sender, EventArgs e)
{
TableRow tr = new TableRow();
TableCell tc1 = new TableCell();
TableCell tc2 = new TableCell();
string strConn = db_connection_string_EINSTEIN;
SqlConnection con = new SqlConnection(strConn);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT id, name FROM agl.guidelineNoteCategories";
con.Open();
DataSet objDs = new DataSet();
SqlDataAdapter dAdapter = new SqlDataAdapter();
dAdapter.SelectCommand = cmd;
dAdapter.Fill(objDs);
if (objDs.Tables[0].Rows.Count > 0)
{
System.Web.UI.WebControls.ListBox lb = new System.Web.UI.WebControls.ListBox();
System.Web.UI.WebControls.TextBox tb = new System.Web.UI.WebControls.TextBox();// { ID = sna.ToString()};
tb.Width = 1000;
tb.ID = "tb";
AjaxControlToolkit.AutoCompleteExtender ace = new AjaxControlToolkit.AutoCompleteExtender();
ace.ServiceMethod="searchNoteValues";
ace.MinimumPrefixLength=2;
ace.CompletionInterval=100;
ace.EnableCaching=false;
ace.CompletionSetCount=10;
ace.TargetControlID="tb";
ace.FirstRowSelected=false;
lb.BorderColor = System.Drawing.Color.Orange;
lb.DataSource = objDs.Tables[0];
lb.DataTextField = "name";
lb.DataValueField = "id";
lb.DataBind();
lb.Items.Insert(0, "--Select--");
tc1.Controls.Add(lb);
tc2.Controls.Add(tb);
tr.Cells.Add(tc1);
tr.Cells.Add(tc2);
notesTable.Rows.Add(tr);
Session["table"] = notesTable;
ViewState["dynamictable"] = true;
}
con.Close();
}
[System.Web.Script.Services.ScriptMethod()]
[System.Web.Services.WebMethod]
public static List<string> searchNoteValues(string prefixText, int count)
{
string strConn = db_connection_string_EINSTEIN;
SqlConnection con = new SqlConnection(strConn);
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
cmd.CommandType = CommandType.Text;
cmd.CommandText = "SELECT id, NoteValue FROM agl.GuidelineNoteValues where isActive = 1 and NoteValue like '%' + #SearchText + '%'";
cmd.Parameters.AddWithValue("#SearchText", prefixText);
con.Open();
List<string> NoteValues = new List<string>();
using (SqlDataReader sdr = cmd.ExecuteReader())
{
while (sdr.Read())
{
NoteValues.Add(sdr["NoteValue"].ToString());
}
}
con.Close();
return NoteValues;
}
}

Got it. Wasn't adding the auto complete extender to the form.
TestForm.Controls.Add(ace);

Issue with List.Add(): it only displays the last row

Issue with List.Add(): it only saves the last added item, it binds the last data repeatedly, please someone help me to clear it. I am trying out in mvc 4 as Begineer. I am also struggling with basic of mvc 4. thank u in advance.
var modelList = new List<MyCourseData>();
string batchid = System.Web.HttpContext.Current.Request.QueryString["batchid"];
SqlConnection con = null;
string result = "";
DataSet ds = null;
con = new SqlConnection(ConfigurationManager.ConnectionStrings["con"].ToString());
SqlCommand cmd = new SqlCommand("select * from [Student].[dbo].[tbl_batch] where batchid=#batchid", con);
//cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#batchid", batchid);
con.Open();
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
ds = new DataSet();
da.Fill(ds);
con.Close();
for (int i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
var model = new MyCourseData();
var classdates = ds.Tables[0].Rows[i]["class_dates"].ToString();
int j = 0;
// string[] parts = classdates.Split(',');
foreach (string CourseDates in classdates.Split(','))
{
model.batchid = ds.Tables[0].Rows[i]["batchid"].ToString();
model.course = ds.Tables[0].Rows[i]["course"].ToString();
model.trainer = ds.Tables[0].Rows[i]["trainer"].ToString();
model.class_dates = CourseDates;
modelList.Add(model);
}
}
return modelList;

This happens because you are adding the same instance of MyCourseData in the list with value changing in every iteration.
You need to create new instance of MyCourseData for every iteration,
var modelList = new List<MyCourseData>();
string batchid = System.Web.HttpContext.Current.Request.QueryString["batchid"];
SqlConnection con = null;
string result = "";
DataSet ds = null;
con = new SqlConnection(ConfigurationManager.ConnectionStrings["con"].ToString());
SqlCommand cmd = new SqlCommand("select * from [Student].[dbo].[tbl_batch] where batchid=#batchid", con);
//cmd.CommandType = CommandType.StoredProcedure;
cmd.Parameters.AddWithValue("#batchid", batchid);
con.Open();
SqlDataAdapter da = new SqlDataAdapter();
da.SelectCommand = cmd;
ds = new DataSet();
da.Fill(ds);
con.Close();
for (int i = 0; i <= ds.Tables[0].Rows.Count - 1; i++)
{
var classdates = ds.Tables[0].Rows[i]["class_dates"].ToString();
int j = 0;
// string[] parts = classdates.Split(',');
foreach (string CourseDates in classdates.Split(','))
{
var model = new MyCourseData();
model.batchid = ds.Tables[0].Rows[i]["batchid"].ToString();
model.course = ds.Tables[0].Rows[i]["course"].ToString();
model.trainer = ds.Tables[0].Rows[i]["trainer"].ToString();
model.class_dates = CourseDates;
modelList.Add(model);
}
}
return modelList;
}

get simple drop down value in webmethod

below is my code in which in want to use dropdownlist but i am unable to call its id: error showing that object require for static method.
[System.Web.Script.Services.ScriptMethod()]
[System.Web.Services.WebMethod]
public static List<string> GetCity(string prefixText)
{
DataTable dt = new DataTable();
string constr = ConfigurationManager.ConnectionStrings["mycon"].ToString();
SqlConnection con = new SqlConnection(constr);
con.Open();
SqlCommand cmd = new SqlCommand("select * from tbl_group where Group_Name=" + drpgovtypelcns1.Selecteditem.Text, con);
cmd.Parameters.AddWithValue("#Group_Name", prefixText);
SqlDataAdapter adp = new SqlDataAdapter(cmd);
adp.Fill(dt);
List<string> CityNames = new List<string>();
for (int i = 0; i < dt.Rows.Count; i++)
{
CityNames.Add(dt.Rows[i][1].ToString());
}
return CityNames;
}

How do I load data into combobox from database

How do I load data into combobox from database? I want to display the supportID into the combobox in the form. the code I am using is pasted here. I am calling BindData() in the formload. Ia m getting exception as: Cannot bind to the new display member.
Parameter name: newDisplayMember. the code I used is:
public void BindData()
{
SqlConnection con = new SqlConnection(#"server=RSTT2; database = Project ; User Id=sa; Password=PeaTeaCee5#");
con.Open();
string strCmd = "select supportID from Support";
SqlCommand cmd = new SqlCommand(strCmd, con);
SqlDataAdapter da = new SqlDataAdapter(strCmd, con);
DataSet ds = new DataSet();
da.Fill(ds);
cbSupportID.DataSource = ds;
cbSupportID.DisplayMember = "supportID";
cbSupportID.ValueMember = "supportID";
cbSupportID.Enabled = true;
cmd.ExecuteNonQuery();
con.Close();
}

The DataSource for your combobox should be a DataTable in this case, try this:
cbSupportID.DataSource = ds.Tables[0];
Or better, you should fill data into a DataTable instead of a DataSet like this:
DataTable dt = new DataTable();
da.Fill(dt);
//...
cbSupportID.DataSource = dt;

public void BindData()
{
SqlConnection con = new SqlConnection(#"server=RSTT2; database = Project ; User Id=sa; Password=PeaTeaCee5#");
con.Open();
string strCmd = "select supportID from Support";
SqlCommand cmd = new SqlCommand(strCmd, con);
SqlDataAdapter da = new SqlDataAdapter(strCmd, con);
DataSet ds = new DataSet();
da.Fill(ds);
cmd.ExecuteNonQuery();
con.Close();
cbSupportID.DisplayMember = "supportID";
cbSupportID.ValueMember = "supportID";
cbSupportID.DataSource = ds;
cbSupportID.Enabled = true;
}
I hope this helps.

Follow this example:
using System;
using System.Data;
using System.Data.SqlClient;
using System.Windows.Forms;
namespace ComboBoxData
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string conStr = #"Server =.\SQLEXPRESS2014; Database=NORTHWND; User Id=sa; Password=******";
SqlConnection conn = new SqlConnection(conStr);
DataSet ds = new DataSet();
string getEmpSQL = "SELECT E.LastName FROM dbo.Employees E;";
SqlDataAdapter sda = new SqlDataAdapter(getEmpSQL, conn);
try
{
conn.Open();
sda.Fill(ds);
}catch(SqlException se)
{
MessageBox.Show("An error occured while connecting to database" + se.ToString());
}
finally
{
conn.Close();
}
comboBox1.DataSource = ds.Tables[0];
comboBox1.DisplayMember = ds.Tables[0].Columns[0].ToString();
}
}
}

CmbDefaultPrinter.DisplayMember = "[table fieldname]";
CmbDefaultPrinter.ValueMember = "[table fieldname]";
CmbDefaultPrinter.DataSource = ds.Tables[0];
CmbDefaultPrinter.Enabled = true;

Mention the Column Name in DataField which you want to load.
and in aspx.cs in page load bind the gridview.
enter code here
<asp:TemplateField>
<ItemTemplate>
<asp:CheckBox ID="chkSelect" runat="server" />
</ItemTemplate>
</asp:TemplateField>
<asp:BoundField DataField="User_Group" HeaderText="UserName" ItemStyle
Width="150px" />

How to get data from SQL database to store in combo box - C#

How can i get the value of company_name from Comp table and store it on a comboBox?
here is my initial code on getting the values from Database and store it on a combobox:
string Sql = "select company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
comboBox1.Items.Add(ds.Tables[0].Rows[i][0].ToString());
it point out to da.fill(ds) and says "Could not locate entry in sysdatabases for database 'select company_name from JO'. No entry found with that name. Make sure that the name is entered correctly."
hope for your reply thanks!

Use datareader it is much simpler \
string Sql = "select company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
conn.Open();
SqlCommand cmd = new SqlCommand(Sql, conn);
SqlDataReader DR = cmd.ExecuteReader();
while (DR.Read())
{
combobox1.Items.Add(DR[0]);
}

If you set up your connection string to be something of this sort:
string SqlConnectionString = "Data Source=[SERVER];Initial Catalog=[DATABASE];"
Then using that set up, you can set your string 'Sql' as:
string Sql = "select company_name from dbo.Comp";
This could be a possible set up you could use to read out the values.
using (SqlConnection saConn = new SqlConnection(this.ConnectionString))
{
saConn.Open();
string query = "select DBName from dbo.Company";
SqlCommand cmd = new SqlCommand(query, saConn);
using (SqlDataReader saReader = cmd.ExecuteReader())
{
while (saReader.Read())
{
string name = saReader.GetString(0);
combobox1.Add(name);
}
}
saConn.Close();
}

I would like to introduce you a very simple way to SQL data into a combobox as:
first you have a create a SQL table,
in C# platform drop a combobox and go to its property,
in the property menu click on "DataSource"
specify the database and table to load into combobox,
Note, the combobox name and table's row should be the same.

{
SqlConnection con =new SqlConnection("Data Source=Server_Name;Initial Catalog=Database_Name;integrated security=true");
SqlCommand cmd;
SqlDataReader dr;
private void CashMemoForm_Load(object sender, EventArgs e)
{
con.Open();
cmd = new SqlCommand("Select Column_Name From Table_Name", con);
dr = cmd.ExecuteReader();
while (dr.Read())
{
comboBox1.Items.Add(dr[0]).ToString();
}
}
}

Have you ever tried Entity Framework for database access and dto creation?

Change your line to cmd.CommandType = CommandType.Text; instead of cmd.CommandType = CommandType.StoredProcedure;

Try this
string Sql = "select Company_ID,company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
comboBox1.DataSource = ds.Tables[0];
comboBox1.DataTextField = "company_name";
comboBox1.DataValueField = "Company_ID";
comboBox1.DataBind();
comboBox1.Items.Insert(0, new ListItem("--Select--", "0"));
}

There is no use of for loop. you just need to check that whether the dataset contains rows or not.
string Sql = "select Company_ID,company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.Text;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows.Count > 0)
{
comboBox1.DataSource = ds.Tables[0];
comboBox1.DataTextField = "company_name";
comboBox1.DataValueField = "Company_ID";
comboBox1.DataBind();
comboBox1.Items.Insert(0, new ListItem("Select", "0"));
}

string Sql = "select company_name from JO.dbo.Comp";
SqlConnection conn = new SqlConnection(connString);
SqlCommand cmd = new SqlCommand(Sql, conn);
cmd.CommandType = CommandType.StoredProcedure;
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
comboBox1.Items.Add(ds.Tables[0].Rows[i][0].ToString());

public System.Data.DataTable EmployeeViewAll()
{
DataTable dtbl = new DataTable();
try
{
// Here it shuld be your database Connection String
string connectionString = "Server = .; database = HKS; Integrated Security = true";
using (SqlConnection sqlCon = new System.Data.SqlClient.SqlConnection(connectionString))
{
SqlDataAdapter SqlDa = new SqlDataAdapter("employeeViewAll", sqlCon);
SqlDa.SelectCommand.CommandType = CommandType.StoredProcedure;
SqlDa.Fill(dtbl);
}
return dtbl;
}
catch (Exception)
{
throw;
}
}
public void ComboFill()
{
DataTable dt = new DataTable();
eSP SP = new eSP();
d = SP.EmployeeViewAll();
comboBox1.DataSource = dt;
comboBox1.DisplayMember = "department";
comboBox1.ValueMember = "empName";
}