Input string was not in a correct format

[Bart]

Hi,

i defined a linkbutton in a gridview. In code-behind, i want to perform the
delete query when the user clicks on the linkbutton, but this code gives
following error:
"Input string was not in a correct format." at line: r =
Convert.ToInt16 (e.CommandArgum ent)

Thanks for help
Bart


aspx file:
--------
<asp:GridView ID="GridView1" runat="server" />
<Columns>
<asp:TemplateFi eld>
<ItemTemplate >
<asp:LinkButt on ID="lb1" runat="server" CommandName="De lete"
Text="delete"
OnClientClick=" return confirm('Cancel ?');" >
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateFie ld>
....

code-behind:
-------------
Protected Sub GridView1_RowCo mmand(ByVal sender As Object, ByVal e As
System.Web.UI.W ebControls.Grid ViewCommandEven tArgs) Handles
GridView1.RowCo mmand
Dim r As Int16
Select Case e.CommandName
Case "Delete"
r = Convert.ToInt16 (e.CommandArgum ent)
Me.GridView1.De leteRow(r)
End Select
End Sub