Hello, Shanti,

RadGridView offers the GroupSummaryEvaluate event where you have access to the calculated value according to the values that are stored in the respective cells. Thus, you can format what exactly is displayed in the summary cell. More information is available here: https://docs.telerik.com/devtools/winforms/controls/gridview/rows/summary-rows 

Please refer to the following code snippet:

Private Sub RadGridView1_GroupSummaryEvaluate(ByVal sender As Object, ByVal e As GroupSummaryEvaluationEventArgs)
    If e.SummaryItem.Name = "UnitPrice" Then
        e.FormatString = String.Format("₹ {0}", e.Value)
    End If
End Sub

I hope this information helps. Should you have other questions please let me know.

Regards,
Nadya
Progress Telerik

Thank you..

 Private Sub grdSearch_GroupSummaryEvaluate(sender As Object, e As GroupSummaryEvaluationEventArgs)
        If e.Value IsNot Nothing Then
            Dim culture As CultureInfo = Nothing
            culture = New CultureInfo("hi-IN")
            e.FormatString = String.Format(culture, "{0:c}", e.Value)
        End If
    End Sub

Hello, Shanti,

Using the CultureInfo class is also a possible solution. Thank you for sharing it with the community. 

Should you have other questions do not hesitate to contact us.

Regards,
Nadya
Progress Telerik