Input string was not in a correct format

  • Thread starter Thread starter Bart
  • Start date Start date
B

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.CommandArgument)

Thanks for help
Bart


aspx file:
--------
<asp:GridView ID="GridView1" runat="server" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lb1" runat="server" CommandName="Delete"
Text="delete"
OnClientClick="return confirm('Cancel?');" >
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
....

code-behind:
-------------
Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As
System.Web.UI.WebControls.GridViewCommandEventArgs) Handles
GridView1.RowCommand
Dim r As Int16
Select Case e.CommandName
Case "Delete"
r = Convert.ToInt16(e.CommandArgument)
Me.GridView1.DeleteRow(r)
End Select
End Sub
 
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.CommandArgument)

Thanks for help
Bart

aspx file:
--------
<asp:GridView ID="GridView1" runat="server" />
           <Columns>
           <asp:TemplateField>
               <ItemTemplate>
               <asp:LinkButton ID="lb1" runat="server"CommandName="Delete"
Text="delete"
                OnClientClick="return confirm('Cancel?');" >
               </asp:LinkButton>
               </ItemTemplate>
           </asp:TemplateField>
...

code-behind:
-------------
Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As
System.Web.UI.WebControls.GridViewCommandEventArgs) Handles
GridView1.RowCommand
        Dim r As Int16
        Select Case e.CommandName
            Case "Delete"
                r = Convert.ToInt16(e.CommandArgument)
                Me.GridView1.DeleteRow(r)
        End Select
End Sub
Click to expand...

Because you did not assign any values to CommandArgument, and by
default it's String.Empty, which cannot be converted to an Int16.
 
Thanks for replying, but

I have no idea which value to assign to CommandArgument. I guess it needs
the index of the selected row ...


"gnewsgroup" <[email protected]> schreef in bericht
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.CommandArgument)

Thanks for help
Bart

aspx file:
--------
<asp:GridView ID="GridView1" runat="server" />
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:LinkButton ID="lb1" runat="server" CommandName="Delete"
Text="delete"
OnClientClick="return confirm('Cancel?');" >
</asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
...

code-behind:
-------------
Protected Sub GridView1_RowCommand(ByVal sender As Object, ByVal e As
System.Web.UI.WebControls.GridViewCommandEventArgs) Handles
GridView1.RowCommand
Dim r As Int16
Select Case e.CommandName
Case "Delete"
r = Convert.ToInt16(e.CommandArgument)
Me.GridView1.DeleteRow(r)
End Select
End Sub
Click to expand...

Because you did not assign any values to CommandArgument, and by
default it's String.Empty, which cannot be converted to an Int16.
 
Thanks for replying, but

I have no idea which value to assign  to CommandArgument. I guess it needs
the index of the selected row ...

"gnewsgroup" <[email protected]> schreef in bericht





Because you did not assign any values to CommandArgument, and by
default it's String.Empty, which cannot be converted to an Int16.- Hide quoted text -

- Show quoted text -
Click to expand...

So, you would like to have the row index? Can you do the following?

<asp:TemplateField>
<ItemTemplate>
<asp:Button ID="AddButton" runat="server"
CommandName="AddToCart"
CommandArgument="<%# ((GridViewRow) Container).RowIndex %>"
Text="Add to Cart" />
</ItemTemplate>
</asp:TemplateField>

It should work for a LinkButton, too.
 
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