programatically creating cascading dropdownlist in radgrid

[Andy]

I'm newbee to ASP.Net. Can anyone give me a code snippet for creating a cascading dropdownlists (Country,state and city) in radgrid, I see many post where in .aspx is used for this, but I want to create everything in .cs file. Its urgent, your help is highly appreciated.

Thanks,
Andy.

[Princy]

Hi Andy,

Please try the below code snippet to programmatically create a cascading dropdownlist.

ASPX:

<telerik:RadGrid ID="RadGrid1" runat="server" AutoGenerateColumns="false" DataSourceID="SqlDataSource1"
     AllowPaging="true"  OnItemCreated="RadGrid1_ItemCreated">
    <MasterTableView>
    </MasterTableView>
</telerik:RadGrid>

C#:

protected void Page_Init(object sender, EventArgs e)

  {     

      string templateColumnName = "OrderID";

      GridTemplateColumn templateColumn = new GridTemplateColumn();

      templateColumn.ItemTemplate = new MyTemplate(templateColumnName);

      templateColumn.HeaderText = "OrderID";

      RadGrid1.MasterTableView.Columns.Add(templateColumn);

     

  }

  private class MyTemplate : ITemplate

  {

      protected DropDownList DropDownList1, DropDownList2, DropDownList3;      

      private string colname;

      public MyTemplate(string cName)

      {

          colname = cName;

      }

      public void InstantiateIn(System.Web.UI.Control container)

      {

          DropDownList1 = new DropDownList();

          DropDownList1.ID = "DropDownList1";

          container.Controls.Add(DropDownList1);

          DropDownList1.DataBinding += new EventHandler(DropDownList1_DataBinding);

 

          DropDownList2 = new DropDownList();

          DropDownList2.ID = "DropDownList2";

          container.Controls.Add(DropDownList2);

 

          DropDownList3 = new DropDownList();

          DropDownList3.ID = "DropDownList3";

          container.Controls.Add(DropDownList3);

      }

 

      void DropDownList1_DataBinding(object sender, EventArgs e)

      {

          DropDownList drop = (DropDownList)sender;

          drop.DataSourceID = "SqlDataSource1";

          drop.DataTextField = "OrderID";

          drop.DataValueField = "OrderID";


      }

  }

 

  protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e)

  {

      if (e.Item is GridDataItem)

      {

          GridDataItem dataItem = (GridDataItem)e.Item;

 

          DropDownList list1 = (DropDownList)dataItem.FindControl("DropDownList1");

          list1.AutoPostBack = true;

          list1.SelectedIndexChanged += new EventHandler(list1_SelectedIndexChanged);

 

          DropDownList list2 = (DropDownList)dataItem.FindControl("DropDownList2");

          list2.AutoPostBack = true;

          list2.SelectedIndexChanged += new EventHandler(list2_SelectedIndexChanged);

      }

  }

  void list2_SelectedIndexChanged(object sender, EventArgs e)

  {

      GridDataItem item = (GridDataItem)(sender as DropDownList).NamingContainer;

      DropDownList ddl3 = (DropDownList)item.FindControl("DropDownList3");

      ddl3.DataSourceID = "SqlDataSource1";

      ddl3.DataTextField = "ShipCity";

  }

 

  void list1_SelectedIndexChanged(object sender, EventArgs e)

  {

      GridDataItem item = (GridDataItem)(sender as DropDownList).NamingContainer;

      DropDownList ddl2 = (DropDownList)item.FindControl("DropDownList2");

      ddl2.DataSourceID = "SqlDataSource1";

      ddl2.DataTextField = "ShipCountry";

  }

Hope this helps,let me know if any concern.

Thanks,
Princy

[Andy]

Thanks Princy, It was cool.