Very simple. Here is the code
Protected Sub Grid1_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles Grid1.ItemDataBound
If Not e.Item.DataItem Is Nothing Then
Dim intBalToAlloc As Int64
Dim intNoHoldQty As Int64
Dim strTable As String
intBalToAlloc = DataBinder.Eval(e.Item.DataItem, "balToAlloc").ToString
intNoHoldQty = DataBinder.Eval(e.Item.DataItem, "intSuborderQtyRemainingNoHolds").ToString
strTable = "Balance to Allocate:" & intBalToAlloc & vbCrLf
strTable += "NoHold Qty Remaining: " & intNoHoldQty & vbCrLf
e.Item.Cells(8).ToolTip = strTable
e.Item.Cells(9).ToolTip = strTable
e.Item.Cells(10).ToolTip = strTable
e.Item.Cells(11).ToolTip = strTable
End If
End Sub