Handling Nulls in Gridview Summary

Hi

I am trying to display the sum of a column in a grdivew. this seems to work fine but if their are nulls in the database then it fails error msg is "Object cannot be cast from DBNull to other types"

How do I get around this

code is attached

thanks in advanced
Dim decCapitalComm As Decimal = 0 
 
If e.Row.RowType = DataControlRowType.DataRow Then
 
            decCapitalComm += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "Capital_commitment"))
                     
        ElseIf e.Row.RowType = DataControlRowType.Footer Then
            e.Row.Cells(1).Text = "Totals:"
            e.Row.Cells(2).Text = decCapitalComm.ToString '("d")               
            e.Row.Cells(1).HorizontalAlign = HorizontalAlign.Right
            e.Row.Font.Bold = True
          
        End If

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patelajkAsked:
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Jorge PaulinoIT Pro/DeveloperCommented:
Try this way

If Not IsNull(DataBinder.Eval(e.Row.DataItem, "Capital_commitment")) Then
   decCapitalComm += Convert.ToDecimal(DataBinder.Eval(e.Row.DataItem, "Capital_commitment"))
End If
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