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Conversion from string "tooltip.BeginShowToolTip(event," to type 'Double' is not valid.

Posted on 2008-10-29
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Last Modified: 2012-06-21
error is pointing in line 3.  

Dim hl As HyperLink = TryCast(e.Row.Cells(0).Controls(0), HyperLink)
            Dim option_num As Integer = Convert.ToInt32(GridView1.DataKeys(e.Row.RowIndex).Value)
            hl.Attributes.Add("onmouseover", "tooltip.BeginShowToolTip(event," + option_num + ")")
            hl.Attributes.Add("onmouseout", "tooltip.HideToolTip()")
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Question by:gianitoo
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Try
hl.Attributes.Add("onmouseover", "tooltip.BeginShowToolTip(event," + option_num.ToString() + ")")
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