how to use delete command in grid view for updation - asp.net

Question

i have 3 web pages. admin,student and teacher. i have used grid view on each of this page.my table is having a column as 'status'.which is having default value 0. I want to update this value to 1 when i click on delete in gridview. I have written following code. But it is not working.pls help.
this is .aspx file code-
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TEMPRUJUConnectionString %>"
SelectCommand="SELECT * FROM [login] WHERE ([username] = #username)"
DeleteCommand="UPDATE [login] SET [status]= 1 WHERE [id]=#id"
InsertCommand="INSERT INTO [login] ([name], [midname], [surname], [username], [password], [contact], [dob], [email], [address], [occupation], [ltype]) VALUES (#name, #midname, #surname, #username, #password, #contact, #dob, #email, #address, #occupation, #ltype)"
UpdateCommand="UPDATE [login] SET [name] = #name, [midname] = #midname, [surname] = #surname, [username] = #username, [password] = #password, [contact] = #contact, [dob] = #dob, [email] = #email, [address] = #address, [occupation] = #occupation, [ltype] = #ltype WHERE [Id] = #Id">
<DeleteParameters>
<asp:Parameter Name="Id" Type="Int32" />
</DeleteParameters>
and this is my code behind-
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
SqlConnection con = new SqlConnection("Data Source=SNEHAL-PC\\SNEHAL1;Initial Catalog=TEMPRUJU;Integrated Security=True");
SqlCommand cmd;
SqlDataReader dr;
con.Open();
GridViewRow row = GridView1.Rows[e.RowIndex];
cmd=new SqlCommand("Update login set status=1 where id='" + GridView1.DataKeys[e.RowIndex].Value.ToString() + "'",con);
dr = cmd.ExecuteReader();
}

Answer 1

when you have SqlDataSource you have no need to implement GridView1_RowDeleting,
first you must tell to SqlDataSource that where it can find the value of delete command parametr(s), in your case #id... for this, you need to set DataKeyNames property on your GridView by database unique key field name, in your case id...
<asp:GridView ID="GridView1" runat="server" DataKeyNames="ID" DataSourceID="SqlDataSource1">
then, to set delete command parameter on SqlDataSource you must tell that, find value of #id from SelectedDataKey property, from GridView like this:
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TEMPRUJUConnectionString %>"
DeleteCommand="UPDATE [login] SET [status]= 1 WHERE [id]=#id">
<DeleteParameters>
<asp:ControlParameter ControlID="GridView1" Name="id" PropertyName="SelectedDataKey" />
</DeleteParameters>
</asp:SqlDataSource>
and finaly, you need to, send a Delete command with your gridView, for this, you can enable deleteing on gridview control to add this <asp:CommandField ShowDeleteButton="True" /> into your grid view markup, or you can convert this field into a TemplateFiled and create your own template with any control _which have_ CommandName property, and set that property (CommandName) to keyword Delete like this :
<asp:LinkButton ID="LinkButton1" runat="server" CommandName="Delete" Text="Delete me"></asp:LinkButton>
this is a sample with Template Field:
<asp:GridView ID="GridView2" runat="server" DataKeyNames="ID" DataSourceID="SqlDataSource1">
<Columns>
<asp:TemplateField ShowHeader="False">
<ItemTemplate>
<asp:LinkButton ID="LinkButton1" runat="server" CausesValidation="False" CommandName="Delete" Text="Delete"></asp:LinkButton>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="UserID" SortExpression="UserID">
<EditItemTemplate>
<asp:TextBox ID="TextBox1" runat="server" Text='<%# Bind("UserID") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label2" runat="server" Text='<%# Bind("UserID") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
<asp:TemplateField HeaderText="Age" SortExpression="Age">
<EditItemTemplate>
<asp:TextBox ID="TextBox2" runat="server" Text='<%# Bind("Age") %>'></asp:TextBox>
</EditItemTemplate>
<ItemTemplate>
<asp:Label ID="Label3" runat="server" Text='<%# Bind("Age") %>'></asp:Label>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:TestConnectionString %>"
DeleteCommand="UPDATE Profiles SET Age = Age+1 where id = #id" SelectCommand="SELECT * FROM Profiles">
<DeleteParameters>
<asp:ControlParameter ControlID="GridView1" Name="id" PropertyName="SelectedDataKey" />
</DeleteParameters>
</asp:SqlDataSource>
and this is a sample with just enable deleteing :
<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="ID" DataSourceID="SqlDataSource1">
<Columns>
<asp:CommandField ShowDeleteButton="True" />
<asp:BoundField DataField="ID" HeaderText="ID" ReadOnly="True" SortExpression="ID" />
<asp:BoundField DataField="UserID" HeaderText="UserID" SortExpression="UserID" />
<asp:BoundField DataField="Age" HeaderText="Age" SortExpression="Age" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:TestConnectionString %>"
DeleteCommand="UPDATE Profiles SET Age = Age+1 where id = #id" SelectCommand="SELECT * FROM Profiles">
<DeleteParameters>
<asp:ControlParameter ControlID="GridView1" Name="id" PropertyName="SelectedDataKey" />
</DeleteParameters>
</asp:SqlDataSource>
i increment age in my sample by every delete command