How to show Value which one not containing in Combo box but brought in data source. - URGENT PLEASE

[Manish]

For Better understaning my problem go through the Image I have attached.

scenario is that I have two values in rad combo box 1 setting in Value field and 1 in Test Field and the 3rd one I have show in another label depending on selected value. 

Means if I have 3 users and total marks 

StudendId - Name - Total Marks

     1          -   Studend1 - 50

     2          -   Studend2 - 60

     3          -   Studend3 - 70

Now I have show 70 in a separate label if I select Student3 to do this as it is only single value I don't want to make any round trip to server. Please help.

 

[Ivan Danchev]

Hello Manish,

If you want to use a third field from the datatable (CellActiveArea) you can do so by setting it as a custom attribute to the ComboBox items. The following section of the documentation shows how this can be achieved. You need to subscribe to the ItemDataBound event and in its handler set the custom attribute:

protected void RadComboBox1_ItemDataBound(object sender, RadComboBoxItemEventArgs e)
{
    DataRowView dataItem = (DataRowView)e.Item.DataItem;
    e.Item.Attributes["CellActiveArea"] = dataItem["CellActiveArea"].ToString();
}

Then on the client you can use the item's client-side API to get the value from the item's custom attribute. Here's an example how this can be done in the ComboBox OnCLientSelectedIndexChanged event handler:

function OnClientSelectedIndexChanged(sender, args) {
    var item = args.get_item();
    alert(item.get_attributes().getAttribute("CellActiveArea"));
}

Regards,
Ivan Danchev
Telerik by Progress