Develop Reference

Dropdownlist with optgroup using WebControlAdapters

I need to do a dropdownlist with optgroup.
I found lots of guides and all foresee the use of WebControlAdapter
this is the guide that I'm fllowing
I've added the class to my App_Code folder project:
namespace admin.App_Code
{
public class DropDownListAdapter :
System.Web.UI.WebControls.Adapters.WebControlAdapter
{
protected override void RenderContents(System.Web.UI.HtmlTextWriter writer)
{
// The current control being "adaptered" is available within context from the Control property
DropDownList dropDownList = (DropDownList)Control;
ListItemCollection items = dropDownList.Items;
// Retrieve Optgrouping using LinQ
var groups = (from p in items.OfType<ListItem>()
group p by p.Attributes["Group"] into g
select new { Label = g.Key, Items = g.ToList<ListItem>
() });
foreach (var group in groups)
{
if (!String.IsNullOrEmpty(group.Label))
{
writer.WriteBeginTag("optgroup");
writer.WriteAttribute("label", group.Label);
writer.Write(">");
}
int count = group.Items.Count();
if (count > 0)
{
bool flag = false;
for (int i = 0; i < count; i++)
{
ListItem item = group.Items[i];
writer.WriteBeginTag("option");
if (item.Selected)
{
if (flag)
{
throw new HttpException("Multiple selected items not allowed");
}
flag = true;
writer.WriteAttribute("selected", "selected");
}
if (!item.Enabled)
{
writer.WriteAttribute("disabled", "true");
}
writer.WriteAttribute("value", item.Value, true);
if (this.Page != null)
{
this.Page.ClientScript.RegisterForEventValidation(dropDownList.UniqueID, item.Value);
}
writer.Write('>');
HttpUtility.HtmlEncode(item.Text, writer);
writer.WriteEndTag("option");
writer.WriteLine();
}
}
if (!String.IsNullOrEmpty(group.Label))
{
writer.WriteEndTag("optgroup");
}
}
}
private Object _ViewState;
protected override void OnLoad(EventArgs e)
{
if (Page.IsPostBack)
{
if (_ViewState != null)
{
Object[] groups = (Object[])_ViewState;
DropDownList dropDownList = (DropDownList)Control;
// Add saved optgroups to ListItems
for (Int32 i = 0; i < groups.Length; i++)
{
if (groups[i] != null)
{
dropDownList.Items[i].Attributes["Group"] = groups[i].ToString();
}
}
}
}
base.OnLoad(e);
}
protected override void LoadAdapterViewState(object state)
{
// Retrieve existing state
_ViewState = state;
}
protected override object SaveAdapterViewState()
{
DropDownList dropDownList = (DropDownList)Control;
Int32 count = dropDownList.Items.Count;
Object[] values = new Object[count];
// Retrieve Optgrouping from ListItem
for (int i = 0; i < count; i++)
{
values[i] = dropDownList.Items[i].Attributes["Group"];
}
return values;
}
}
}
public static void loadDDLModelli(ref DropDownList ddl, List<dynamic>
objects)
{
Int16 cont = 0;
ddl.Items.Clear();
System.Web.UI.WebControls.ListItem li;
String idModello = "";
String nomeModello = "";
String nomeBrand = "";
String oggetto = "";
List<System.Web.UI.WebControls.ListItem> items = new List<System.Web.UI.WebControls.ListItem>();
foreach (var item in objects)
{
oggetto = item.ToString().Replace("{", "").Replace("}", "");
idModello = oggetto.Split(',')[0].Split('=')[1].Trim();
nomeModello = oggetto.Split(',')[1].Split('=')[1].Trim();
nomeBrand = oggetto.Split(',')[2].Split('=')[1].Trim();
li = new System.Web.UI.WebControls.ListItem(nomeBrand+" - "+nomeModello, idModello);
li.Attributes["Group"] = nomeBrand;
items.Add(li);
cont++;
};
ddl.DataSource = items;
ddl.DataBind();
ddl.SelectedIndex = -1;
}
I've added the folder App_Browser to my project (did not exist) and I've added the file BrowserFile.browser
<browsers>
<browser refID="Default">
<controlAdapters>
<adapter controlType="System.Web.UI.WebControls.DropDownList"
adapterType="admin.App_Code.DropDownListAdapter" />
</controlAdapters>
</browser>
</browsers>
in my page .aspx (that is in the same folder of the class DropDownListAdapter I have
<asp:DropDownList runat="server" ID="ddlModelli" CssClass="form-control multipleSelect"></asp:DropDownList>
that is filled in this way
public static void loadDDLModelli(ref DropDownList ddl, List<dynamic> objects)
{
Int16 cont = 0;
ddl.Items.Clear();
System.Web.UI.WebControls.ListItem li;
String idModello = "";
String nomeModello = "";
String nomeBrand = "";
String oggetto = "";
List<System.Web.UI.WebControls.ListItem> items = new List<System.Web.UI.WebControls.ListItem>();
foreach (var item in objects)
{
oggetto = item.ToString().Replace("{", "").Replace("}", "");
idModello = oggetto.Split(',')[0].Split('=')[1].Trim();
nomeModello = oggetto.Split(',')[1].Split('=')[1].Trim();
nomeBrand = oggetto.Split(',')[2].Split('=')[1].Trim();
li = new System.Web.UI.WebControls.ListItem(nomeBrand+" - "+nomeModello, idModello);
li.Attributes["Group"] = nomeBrand;
items.Add(li);
cont++;
};
ddl.DataSource = items;
ddl.DataBind();
ddl.SelectedIndex = -1;
}
the problem is that, when I watch the source code I do not have the optgroup tag but only options tag.
In fact, if I put a breakpoint in the first line of the method RenderContents this doesn't fire.
What I'm doing wrong?

I solved the issue.
The problem was in the method LoadDDLModelli.
Instead of setting DataSource and do the DataBind to the Dropdownlist passed via reference, I have to add ItemList singoularly (I cannot understand the difference)
public static void loadDDLModelli(ref DropDownList ddl, List<dynamic> objects)
{
Int16 cont = 0;
ddl.Items.Clear();
System.Web.UI.WebControls.ListItem li;
String idModello = "";
String nomeModello = "";
String nomeBrand = "";
String oggetto = "";
List<System.Web.UI.WebControls.ListItem> items = new List<System.Web.UI.WebControls.ListItem>();
foreach (var item in objects)
{
oggetto = item.ToString().Replace("{", "").Replace("}", "");
idModello = oggetto.Split(',')[0].Split('=')[1].Trim();
nomeModello = oggetto.Split(',')[1].Split('=')[1].Trim();
nomeBrand = oggetto.Split(',')[2].Split('=')[1].Trim();
li = new System.Web.UI.WebControls.ListItem(nomeBrand+" - "+nomeModello, idModello);
li.Attributes["Group"] = nomeBrand;
items.Add(li);
cont++;
};
//ddl.DataSource = items;
//ddl.DataBind();
foreach(ListItem i in items)
ddl.Items.Add(i);
ddl.SelectedIndex = -1;
}

ReportViewer multiple result of listbox

I have to make a Report with a list box where multiple results are selected
Image
but when I get to the datatable I do not know how to make it show the result of the different values. Selected.
This is my code...
protected void CargaReporte(object sender, EventArgs e)
{
dsReportes.SP_REPORTE_EVENTOS_CALENDARIODataTable dt = new dsReportes.SP_REPORTE_EVENTOS_CALENDARIODataTable();
dsReportesTableAdapters.SP_REPORTE_EVENTOS_CALENDARIOTableAdapter da = new dsReportesTableAdapters.SP_REPORTE_EVENTOS_CALENDARIOTableAdapter();
ReportDataSource RD = new ReportDataSource();
List<dynamic> lst = new List<dynamic>();
if (ddUsu.SelectedIndex == 0)
{
foreach (ListItem item in ddUsu.Items)
{
if (item.Selected)
{
da.Fill(dt, int.Parse(ddUsu.SelectedValue));
lst.Add(dt);
}
}
}
else
{
da.Fill(dt, int.Parse(ddUsu.SelectedValue == "" ? "0" : ddUsu.SelectedValue));
}
divReporte.Visible = true;
RD.Value = lst.ToArray();
RD.Name = "dbCalendarioEventos";
rvReporteCalendarioEventos.LocalReport.DataSources.Clear();
rvReporteCalendarioEventos.LocalReport.DataSources.Add(RD);
rvReporteCalendarioEventos.LocalReport.ReportEmbeddedResource = "ReporteCalendarioEventos.rdlc";
rvReporteCalendarioEventos.LocalReport.ReportPath = #"Reportes\Calendario\ReporteCalendarioEventos.rdlc";
rvReporteCalendarioEventos.LocalReport.Refresh();
}
How can I fill out the report with two or more results?

Resolved:
Create an additional DataTable to save the information set after the path through the foreach and so I can get the result I share part of the code.
string participante = (txtParticipante.Value == "" ? " " : txtParticipante.Value);
dsReportes.SP_REPORTE_EVENTOS_CALENDARIODataTable dt = new dsReportes.SP_REPORTE_EVENTOS_CALENDARIODataTable();
DataTable table = new DataTable();
dsReportesTableAdapters.SP_REPORTE_EVENTOS_CALENDARIOTableAdapter da = new dsReportesTableAdapters.SP_REPORTE_EVENTOS_CALENDARIOTableAdapter();
ReportDataSource RD = new ReportDataSource();
table = dt.Clone();
var FechaInicio_ini = FechaInicio(CEV_FECHA_INICIO_ini.Value);
var FechaInicio_fin = FechaFin(CEV_FECHA_INICIO_fin.Value);
var FechaFin_ini = FechaInicio(CEV_FECHA_FIN_Ini.Value);
var FechaFin_fin = FechaFin(CEV_FECHA_FIN_fin.Value);
try
{
if (ddUsu.SelectedValue != "")
{
foreach (ListItem item in ddUsu.Items)
{
if (item.Selected == true)
{
da.Fill(dt, int.Parse(item.Value),
FechaInicio_ini, FechaInicio_fin,
FechaFin_ini, FechaFin_fin,(txtParticipante.Value == "" ? " " : txtParticipante.Value));
foreach (DataRow dr in dt)
{
table.Rows.Add(dr.ItemArray);
}
}
}
}
else
{
foreach(ListItem item in ddUsu.Items)
{
da.Fill(dt, int.Parse(item.Value == "" ? "0" : item.Value),
FechaInicio_ini, FechaInicio_fin,
FechaFin_ini, FechaFin_fin, (txtParticipante.Value == "" ? " " : txtParticipante.Value));
foreach (DataRow dr in dt)
{
table.Rows.Add(dr.ItemArray);
}
}
}
divReporte.Visible = true;
RD.Value = table;
RD.Name = "dbCalendarioEventos";
rvReporteCalendarioEventos.LocalReport.DataSources.Clear();
rvReporteCalendarioEventos.LocalReport.DataSources.Add(RD);
rvReporteCalendarioEventos.LocalReport.ReportEmbeddedResource = "ReporteCalendarioEventos.rdlc";
rvReporteCalendarioEventos.LocalReport.ReportPath = #"Reportes\Calendario\ReporteCalendarioEventos.rdlc";
rvReporteCalendarioEventos.LocalReport.Refresh();
}
catch(Exception ex) { }
}
image 2

adding drop down list in gridview using c# in asp.net

I'm currently working on my shopping cart. and I'm wondering how I can add drop down list column for quantity in every item that is inside the Cart. And also I want the limit of drop down list to be the number of the product stock. Hoping for a brief explanation. Thank you. :)
Cart.aspx.cs
protected void theCart()
{
var dt = new DataTable();
double totalPrice = 0;
dt.Columns.Add("product_name");
dt.Columns.Add("product_price");
dt.Columns.Add("product_stock");
List<ShoppingCartModel> shoppingList = (List<ShoppingCartModel>)Session["memberCart"];
if (shoppingList != null)
{
foreach (var item in shoppingList)
{
dt.Rows.Add(item.ProductName, item.Price, item.ProductStock);
totalPrice += item.Price;
}
}
lbl_total.Text = totalPrice.ToString();
MyGridView.DataSource = dt;
MyGridView.DataBind();
}
WebShop.aspx.cs
protected void pro_tbl_ItemCommand(object source, DataListCommandEventArgs e)
{
if (e.CommandName == "addtocart")
{
List<ShoppingCartModel> shoppingList = (List<ShoppingCartModel>)Session["memberCart"];
if (shoppingList == null)
{
shoppingList = new List<ShoppingCartModel>();
}
ShoppingCartModel shoppingModel = new ShoppingCartModel();
shoppingModel.ProductId = ((HiddenField)e.Item.FindControl("lblProductId")).Value;
shoppingModel.ProductName = ((Label)e.Item.FindControl("lbl_pname")).Text;
shoppingModel.ProductDescription = ((Label)e.Item.FindControl("lbl_pdesc")).Text;
shoppingModel.ProductStock = Convert.ToInt32(((Label)e.Item.FindControl("lbl_pstock")).Text);
shoppingModel.Price = Convert.ToDouble(((Label)e.Item.FindControl("lbl_price")).Text);
shoppingList.Add(shoppingModel);
Session["memberCart"] = shoppingList;
lbl_result.Text = "Product has been added to the cart";
}
}

Dropdownlist control value not saving to database

I have two dropdownlist controls on an add/edit form page, one for countries (called CountryCode) and one for regions/states (called ProvinceCode). The code has been set up so that, when users select "United States" from the country dropdownlist, then the region dropdownlist is populated with all valid US states. If the user selects "Canada" from the country dropdownlist, then the region dropdownlist is populated with valid provinces. This functionality works fine, but when "Canada" is selected, for some reason, the region dropdownlist's value is never saved to the database. I am not sure why this is, especially since I can save US states just fine.
This is the code that is meant to populate the country and region dropdownlists:
protected void Page_Init(object sender, EventArgs e)
{
CountryCode.DataSource = CountryDataSource.LoadAll("Name");
CountryCode.DataBind();
InitCountryAndProvince();
}
private void InitCountryAndProvince()
{
//MAKE SURE THE CORRECT ADDRESS IS SELECTED
Address address = this.Address;
bool foundCountry = false;
if (!string.IsNullOrEmpty(address.CountryCode))
{
ListItem selectedCountry = CountryCode.Items.FindByValue(address.CountryCode);
if (selectedCountry != null)
{
CountryCode.SelectedIndex = CountryCode.Items.IndexOf(selectedCountry);
foundCountry = true;
}
}
if (!foundCountry)
{
Warehouse defaultWarehouse = AbleContext.Current.Store.DefaultWarehouse;
ListItem selectedCountry = CountryCode.Items.FindByValue(defaultWarehouse.CountryCode);
if (selectedCountry != null) CountryCode.SelectedIndex = CountryCode.Items.IndexOf(selectedCountry);
}
//MAKE SURE THE PROVINCE LIST IS CORRECT FOR THE COUNTRY
UpdateCountry();
//NOW LOOK FOR THE PROVINCE TO SET
ListItem selectedProvince = ProvinceCode.Items.FindByValue(address.Province);
if (selectedProvince != null) ProvinceCode.SelectedIndex = ProvinceCode.Items.IndexOf(selectedProvince);
}
private void UpdateCountry()
{
//SEE WHETHER POSTAL CODE IS REQUIRED
string[] countries = AbleContext.Current.Store.Settings.PostalCodeCountries.Split(",".ToCharArray());
//PostalCodeRequired.Enabled = (Array.IndexOf(countries, Country.SelectedValue) > -1);
//SEE WHETHER PROVINCE LIST IS DEFINED
IList<Province> provinces = ProvinceDataSource.LoadForCountry(CountryCode.SelectedValue);
if (provinces.Count > 0)
{
IEnumerable<Province> sortedProvinces = provinces.OrderBy(f => f.Name);
provinces = sortedProvinces.ToList();
ProvinceCode.Visible = false;
ProvinceCode.Visible = true;
ProvinceCode.Items.Clear();
ProvinceCode.Items.Add(string.Empty);
foreach (Province province in provinces)
{
string provinceValue = (!string.IsNullOrEmpty(province.ProvinceCode) ? province.ProvinceCode : province.Name);
ProvinceCode.Items.Add(new ListItem(province.Name, provinceValue));
}
ListItem selectedProvince = FindSelectedProvince();
if (selectedProvince != null) selectedProvince.Selected = true;
ProvinceCode.Enabled = true;
ProvinceCode.Text = string.Empty;
}
else
{
ProvinceCode.Visible = true;
ProvinceCode.Visible = false;
ProvinceCode.Items.Clear();
//Province2Required.Enabled = false;
}
}
private ListItem FindSelectedProvince()
{
string defaultValue = ProvinceCode.Text;
if (string.IsNullOrEmpty(defaultValue)) defaultValue = Request.Form[ProvinceCode.UniqueID];
if (string.IsNullOrEmpty(defaultValue)) return null;
defaultValue = defaultValue.ToUpperInvariant();
foreach (ListItem item in ProvinceCode.Items)
{
string itemText = item.Text.ToUpperInvariant();
string itemValue = item.Value.ToUpperInvariant();
if (itemText == defaultValue || itemValue == defaultValue) return item;
}
return null;
}
protected void Country_Changed(object sender, EventArgs e)
{
//UPDATE THE FORM FOR THE NEW COUNTRY
UpdateCountry();
}
This is the section of the save method that contains the country and region dropdownlist controls:
private void SaveCustomerInfo(int CustID)
{
int currentUserID = AbleContext.Current.UserId;
string editQuery = "UPDATE Customers SET BillToRegion = #BillToRegion, BillToCountry = #BillToCountry WHERE CustomerID = #CustomerID";
string addQuery = "INSERT INTO Customers (BillToRegion, BillToCountry) VALUES(#BillToRegion, #BillToCountry)";
try
{
using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["AbleCommerce"].ToString()))
{
cn.Open();
SqlCommand cmd = new SqlCommand();
cmd.Connection = cn;
cmd.Parameters.Add(new SqlParameter("#BillToRegion", ProvinceCode.SelectedValue));
cmd.Parameters.Add(new SqlParameter("#BillToCountry", CountryCode.SelectedValue));
cmd.ExecuteNonQuery();
cn.Close();
}
}
catch (Exception exception)
{
Logger.Warn("Admin\\People\\Customers\\EditCustomer.aspx - SaveCustomerInfo", exception);
}
And this is the code that is called when the page loads to populate fields with values from the database (if the user is editing an existing entry):
protected void Page_Load(object sender, EventArgs e)
{
_CustomerID = AlwaysConvert.ToInt(Request.QueryString["CustomerID"]);
int.TryParse(Request.QueryString["CustomerID"], out _CustomerID);
if (_CustomerID == 0)
{
AddBtn.Visible = true;
EditBtn.Visible = false;
}
else
{
custIDHidden.Value = _CustomerID.ToString();
AddBtn.Visible = false;
EditBtn.Visible = true;
}
if (!Page.IsPostBack)
{
if (_CustomerID != 0)
{
string selectQuery = "BillToRegion, BillToCountry FROM Customers WHERE CustomerID = #CustomerID";
try
{
using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["AbleCommerce"].ToString()))
{
cn.Open();
SqlCommand cmd = new SqlCommand(selectQuery, cn);
cmd.Parameters.Add(new SqlParameter("#CustomerID", custIDHidden.Value));
using (IDataReader reader = cmd.ExecuteReader())
{
while (reader.Read())
{
ProvinceCode.SelectedValue = reader["BillToRegion"].ToString();
CountryCode.SelectedValue = reader["BillToCountry"].ToString();
}
}
cn.Close();
}
}
catch (Exception x)
{
Logger.Warn("Admin\\People\\Customers\\EditCustomer.aspx - Page_Load", x);
}
}
}
}

How can I get the CheckBoxList selected values, what I have doesn't seem to work C#.NET/VisualWebPart

I am creating a CheckBoxList in a class file and am using an HTMLTextWriter to render the control.
I'm using the following code to store the selected values in a string:
string YrStr = "";
for (int i = 0; i < YrChkBox.Items.Count; i++)
{
if (YrChkBox.Items[i].Selected)
{
YrStr += YrChkBox.Items[i].Value + ";";
}
}
I stepped through the code and it doesn't seem to hit the inside of the if statement & the selected value attribute is false every time ... Anyone have an idea of how I can address this?
I populate it using the following:
YrChkBox.Items.Add(new ListItem("Item 1", "Item1"));

In your ASPX page you've got the list like this:
<asp:CheckBoxList ID="YrChkBox" runat="server"
onselectedindexchanged="YrChkBox_SelectedIndexChanged"></asp:CheckBoxList>
<asp:Button ID="button" runat="server" Text="Submit" />
In your code behind aspx.cs page, you have this:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// Populate the CheckBoxList items only when it's not a postback.
YrChkBox.Items.Add(new ListItem("Item 1", "Item1"));
YrChkBox.Items.Add(new ListItem("Item 2", "Item2"));
}
}
protected void YrChkBox_SelectedIndexChanged(object sender, EventArgs e)
{
// Create the list to store.
List<String> YrStrList = new List<string>();
// Loop through each item.
foreach (ListItem item in YrChkBox.Items)
{
if (item.Selected)
{
// If the item is selected, add the value to the list.
YrStrList.Add(item.Value);
}
else
{
// Item is not selected, do something else.
}
}
// Join the string together using the ; delimiter.
String YrStr = String.Join(";", YrStrList.ToArray());
// Write to the page the value.
Response.Write(String.Concat("Selected Items: ", YrStr));
}
Ensure you use the if (!IsPostBack) { } condition because if you load it every page refresh, it's actually destroying the data.

Try something like this:
foreach (ListItem listItem in YrChkBox.Items)
{
if (listItem.Selected)
{
//do some work
}
else
{
//do something else
}
}

check boxlist selected values with seperator
string items = string.Empty;
foreach (ListItem i in CheckBoxList1.Items)
{
if (i.Selected == true)
{
items += i.Text + ",";
}
}
Response.Write("selected items"+ items);

An elegant way to implement this would be to make an extension method, like this:
public static class Extensions
{
public static List<string> GetSelectedItems(this CheckBoxList cbl)
{
var result = new List<string>();
foreach (ListItem item in cbl.Items)
if (item.Selected)
result.Add(item.Value);
return result;
}
}
I can then use something like this to compose a string will all values separated by ';':
string.Join(";", cbl.GetSelectedItems());

// Page.aspx //
// To count checklist item
int a = ChkMonth.Items.Count;
int count = 0;
for (var i = 0; i < a; i++)
{
if (ChkMonth.Items[i].Selected == true)
{
count++;
}
}
// Page.aspx.cs //
// To access checkbox list item's value //
string YrStrList = "";
foreach (ListItem listItem in ChkMonth.Items)
{
if (listItem.Selected)
{
YrStrList = YrStrList + "'" + listItem.Value + "'" + ",";
}
}
sMonthStr = YrStrList.ToString();

// aspx.cs
// Load CheckBoxList selected items into ListBox
int status = 1;
foreach (ListItem s in chklstStates.Items )
{
if (s.Selected == true)
{
if (ListBox1.Items.Count == 0)
{
ListBox1.Items.Add(s.Text);
}
else
{
foreach (ListItem list in ListBox1.Items)
{
if (list.Text == s.Text)
{
status = status * 0;
}
else
{
status = status * 1;
}
}
if (status == 0)
{ }
else
{
ListBox1.Items.Add(s.Text);
}
status = 1;
}
}
}
}