Question

I made a GridView with delete and edit link buttons to perform edit and delete action. This works for the edit button, but not for the delete button. What is the problem?

And when I run my application, it gives me this error:

Must declare the scalar variable “@UserName”

<asp:Content ID="Content1" ContentPlaceHolderID="HeadContent" runat="server">
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" 
DataSourceID="SqlDataSource1">
<Columns>
<asp:CheckBoxField DataField="IsApproved" HeaderText="IsApproved"
SortExpression="IsApproved" />
<asp:BoundField DataField="UserName" HeaderText="UserName" 
SortExpression="UserName" />
<asp:CheckBoxField DataField="IsLockedOut" HeaderText="IsLockedOut" 
SortExpression="IsLockedOut" />
<asp:CommandField ShowEditButton="True" ShowDeleteButton="True" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
ConnectionString="<%$ ConnectionStrings:ApplicationServices %>" 
SelectCommand="SELECT [IsApproved], [UserName], [IsLockedOut] FROM [vw_aspnet_MembershipUsers]" 
UpdateCommand="UPDATE [vw_aspnet_MembershipUsers] SET IsApproved = @IsApproved, IsLockedOut = @IsLockedOut WHERE (UserName = @UserName)"
DeleteCommand="DELETE FROM [vw_aspnet_MembershipUsers] WHERE (UserName = @UserName)">
<UpdateParameters>
<asp:Parameter Name="IsApproved" />
<asp:Parameter Name="IsLockedOut" />
<asp:Parameter Name="UserName" />
</UpdateParameters> 
<DeleteParameters>
<asp:Parameter Name="IsApproved" />
<asp:Parameter Name="IsLockedOut" />
<asp:Parameter Name="UserName" />
</DeleteParameters> 

</asp:SqlDataSource>
</asp:Content>

Answer 1

You should either delete via Membership.DeleteUser(user.UserName) or via Stored-Procedure [dbo].[aspnet_Users_DeleteUser]

http://www.salmontraining.com/SqlExpressZone/articles/deleting_users_from_membership.html