Setting GridDropDownColumn DataSource server side

[Michael]

After reviewing the documentation and help files I'm still doing something wrong.  I can actually get the dropdown to display correctly on and insert and edit modes. Everything is working there fine and saving correctly.  I'm having troubles with the value displaying on load. Here's what I've got.

<telerik:GridDropDownColumn UniqueName="WatchdogFrequencyddl" ListTextField="Name" ListValueField="Watchdogfrequencyid" DataField="Watchdogfrequencyid"
  SortExpression="Watchdogfrequencyid" HeaderText="Frequency" DropDownControlType="DropDownList" FooterText="RadComboBox column footer" >
</telerik:GridDropDownColumn>

protected void WDTGrid_ItemDataBound(object sender, GridItemEventArgs e)
{
   if (e.Item is GridEditableItem && e.Item.IsInEditMode) //fire for both edit and insert
   {
     GridEditableItem eeditItem = e.Item as GridEditableItem;
     GridEditManager editMgr = editItem.EditManager;
     GridDropDownListColumnEditor wdfEditor = editMgr.GetColumnEditor("WatchdogFrequencyddl") as GridDropDownListColumnEditor;
      string s = DataBinder.Eval(editItem.DataItem, "Watchdogfrequencyid").ToString(); //the field should point to the ListValueField of the dropdown editor

      wdfEditor.DataSource = getWatchdogFrequency();
      wdfEditor.DataBind();
      wdfEditor.SelectedValue = s;



    }
}

[Princy]

Hi,

For the GridDropdownColumn to populate in the normal mode you need to assign a datasource .An alternative would be to  access the control  in the ItemDataBound event and set the value  as shown below:

C#

  if (e.Item is GridDataItem)
        {
            GridDataItem dataItem = (GridDataItem)e.Item;

            ((Literal)dataItem["CategoryNameDropdownColumn"].Controls[0]).Text = dataItem.GetDataKeyValue("CategoryName").ToString();
        }

Thanks,

Princy

[Michael]

When I add that to my ItemDataBound event. I get the 'Object reference not set to an instance of an object' error.  This is what I added. I know I'm missing something but just can't make the connection to what it is.
Here's what I added to the ItemDataBound event:

            if (e.Item is GridDataItem)
            {
                GridDataItem dataItem = (GridDataItem)e.Item;

                ((Literal)dataItem["WatchdogFrequencyddl"].Controls[0]).Text = dataItem.GetDataKeyValue("Name").ToString();
            }

Where dataItem.GetDataKeyValue("Name"). is the value I want to display. The error fires on the line starting with ((Literal)dataItem.........

Is there another way to set the datasource of a griddropdowncolumn on the server? Or is it best to set it clientside using a declarative clientside datasource?

Thanks

[Princy]

Hi,

Please  make sure that you have added "Name" datafield to the DataKeyNames collection of RadGrid.

ASPX:

    <MasterTableView DataSourceID="SqlDataSource1"  DataKeyNames="Name"  Name="Master">

Thanks,

Princy

[Tarang]

how the same condition fire for both edit and insert ? 

please tell so that i can get help from your post..