Set Expression depending on if DataValue is null

[Matthew]

Right now, I have two GridBoundColumns pulling OfficePhone and Extension from a SQL database.

<telerik:GridBoundColumn HeaderText="Phone" DataField="OfficePhone" UniqueName="OfficePhone">
</telerik:GridBoundColumn>

<telerik:GridBoundColumn HeaderText="Ext" DataField="Extension" UniqueName="Extension">
</telerik:GridBoundColumn>

I would like to combine the two columns into one, into something like this:

<telerik:GridCalculatedColumn HeaderText="Phone" UniqueName="Phone" DataType="System.String" DataFields="OfficePhone, Extension" Expression="{0} + ' ext. ' + {1})">
</telerik:GridCalculatedColumn>

but extension is usually null or "", causing most of the cells to go blank.

Is there a way to set the expression programmatically, depending on whether there is a value for extension?

[Matthew]

I was able to figure it out using ClientDataKeyNames and ItemDataBound.

<MasterTableView AutoGenerateColumns="false" DataKeyNames="ID" Name="Roster" HierarchyLoadMode="Client" GroupLoadMode="Client"
ClientDataKeyNames="ID,OfficePhone,Extension">

And in the .cs:

protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e)
    {
        if (e.Item is GridDataItem)
        {
            GridDataItem dataItem = e.Item as GridDataItem;
            string strOfficePhone = dataItem.GetDataKeyValue("OfficePhone").ToString();
            string strExtension = dataItem.GetDataKeyValue("Extension").ToString();
            if (strExtension == null || strExtension == String.Empty)
            {
                dataItem["Phone"].Text = strOfficePhone;
            }
            else
            {
                dataItem["Phone"].Text = strOfficePhone + " ext. " + strExtension;
            }
        }
    }

[Andrey]

Hi,

Thank you for contacting us.

Yes, this is the approach I would suggest, however, I would recommend to use the DataKeyNames collection instead of the ClientDataKeyNames collection, because the ClientDatakeyNames collection is serialized to the client since it is mainly used for accessing a cell value on the client-side with JavaScript.

Other than that your approach looks OK. Let me know if you have further questions.

Kind regards,
Andrey
the Telerik team