Dropdown inside a repeater RSS

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  .net_junkie

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  Dropdown inside a repeater

  Nov 01, 2012 07:31 AM|LINK

  I have a dropdown inside a repeater and i am filling it using a datatable

  {
          try
          {
  
              if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
              {
  
                  DataTable dt = new DataTable();
                  dt = Common.LoadExample();
                  DropDownList ddl = (DropDownList)e.Item.FindControl("DropDownList1");
                  ddl.DataSource = dt;
                  ddl.DataTextField = "Name";
                  ddl.DataValueField = "Name";
                  ddl.DataBind();
  
              }
          }
          catch (Exception ex)
          {
              throw;
  
          }

  i am getting the values from datatable but here ddl.DataSource = dt;  i am getting an error like Object reference not set to an instance of an object anyone help me on this??

   

  It is not about what caused you to fall flat on your back that defines you; it is what you do to get back up on your feet.
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  adeelehsan

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  Re: Dropdown inside a repeater

  Nov 01, 2012 07:36 AM|LINK

  Make sure that the you do have dropdown with name DropDownList1. It seems that FindControl can not find it properly.

  Please Mark As Answer if it helped.
  

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  .net_junkie

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  Re: Dropdown inside a repeater

  Nov 01, 2012 07:41 AM|LINK

  I have the dropdown

  It is not about what caused you to fall flat on your back that defines you; it is what you do to get back up on your feet.
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  oned_gk

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  Re: Dropdown inside a repeater

  Nov 01, 2012 07:44 AM|LINK

  <ItemTemplate>
      <asp:DropDownList id="DropDownList1" runat="server" />
      </ItemTemplate>
      <AlternatingItemTemplate>
      <asp:DropDownList id="DropDownList1" runat="server" />
      </AlternatingItemTemplate>

  Programming to simplify, dont look for hard way
  • Edited by oned_gk on Nov 01, 2012 07:45 AM
  • Edited by oned_gk on Nov 01, 2012 07:47 AM
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  .net_junkie

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  Re: Dropdown inside a repeater

  Nov 01, 2012 07:45 AM|LINK

  It is inside the header template.

  <asp:Repeater ID="Repeater2" runat="server"
          onitemdatabound="Repeater2_ItemDataBound">
      <HeaderTemplate>
     <table>
     <tr>
     <td>
  
         <asp:DropDownList ID="DropDownList8" runat="server">
          <asp:ListItem>Select</asp:ListItem>
          <asp:ListItem>Left</asp:ListItem>
          <asp:ListItem>Right</asp:ListItem>
          <asp:ListItem>SubString</asp:ListItem>
         </asp:DropDownList>
         <asp:DropDownList ID="DropDownList7" runat="server">
      <asp:ListItem>1</asp:ListItem>
         <asp:ListItem>2</asp:ListItem>
         <asp:ListItem>3</asp:ListItem>
         </asp:DropDownList>
         <asp:DropDownList ID="DropDownList1" runat="server">
         </asp:DropDownList>
         <asp:DropDownList ID="DropDownList2" runat="server">
         </asp:DropDownList>
         <asp:Button ID="Button1" runat="server" Text="Button" />
     </td>
     </tr>
     </table>
     </HeaderTemplate>
     
     <FooterTemplate>
     <br />
         <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
     </FooterTemplate>
      </asp:Repeater>

  It is not about what caused you to fall flat on your back that defines you; it is what you do to get back up on your feet.
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  oned_gk

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  Re: Dropdown inside a repeater

  Nov 01, 2012 07:50 AM|LINK

  Your ddl not in item or alternate, but in header

  You have find the control with if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)

  Move the ddl to item & alternate template or use if (e.Item.ItemType = ListItemType.Header)

  Programming to simplify, dont look for hard way
  • Edited by oned_gk on Nov 01, 2012 07:52 AM
  • Edited by oned_gk on Nov 01, 2012 07:54 AM
  • Marked as answer by .net_junkie on Nov 02, 2012 04:38 AM
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  .net_junkie

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  Re: Dropdown inside a repeater

  Nov 01, 2012 07:53 AM|LINK

  I have already checked for it you can see my code above

  It is not about what caused you to fall flat on your back that defines you; it is what you do to get back up on your feet.
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  oned_gk

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  Re: Dropdown inside a repeater

  Nov 01, 2012 07:56 AM|LINK

  your control inside headertemplate, not item/alternate template

  <HeaderTemplate>
     <table>
     <tr>
     <td>
   
         <asp:DropDownList ID="DropDownList8" runat="server">
          <asp:ListItem>Select</asp:ListItem>
          <asp:ListItem>Left</asp:ListItem>
          <asp:ListItem>Right</asp:ListItem>
          <asp:ListItem>SubString</asp:ListItem>
         </asp:DropDownList>
         <asp:DropDownList ID="DropDownList7" runat="server">
      <asp:ListItem>1</asp:ListItem>
         <asp:ListItem>2</asp:ListItem>
         <asp:ListItem>3</asp:ListItem>
         </asp:DropDownList>
         <asp:DropDownList ID="DropDownList1" runat="server">
         </asp:DropDownList>
         <asp:DropDownList ID="DropDownList2" runat="server">
         </asp:DropDownList>
         <asp:Button ID="Button1" runat="server" Text="Button" />
     </td>
     </tr>
     </table>
  </HeaderTemplate>

  See below

      <ItemTemplate> 
      <asp:DropDownList id="DropDownList1" runat="server" /> 
      </ItemTemplate> 
  

      <AlternatingItemTemplate> 
      <asp:DropDownList id="DropDownList1" runat="server" /> 
      </AlternatingItemTemplate>

  Programming to simplify, dont look for hard way
  • Edited by oned_gk on Nov 01, 2012 07:57 AM
  • Edited by oned_gk on Nov 01, 2012 07:58 AM
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  .net_junkie

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  825 Posts

  Re: Dropdown inside a repeater

  Nov 01, 2012 09:24 AM|LINK

  when i use if (e.Item.ItemType == ListItemType.Header) i am unable to fill the DDL as e.Item.ItemType is item and ListItemType.Header is header so the breakpoint is skipping the code and DDL is empty.

  It is not about what caused you to fall flat on your back that defines you; it is what you do to get back up on your feet.
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  oned_gk

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  Re: Dropdown inside a repeater

  Nov 01, 2012 04:40 PM|LINK

  cut from header then create item and alternate, paste in both
  Programming to simplify, dont look for hard way