Grid View delete field got error

Question

'GridView1_RowDeleting' is not a member of 'ASP.viewuser_aspx'.

 

<asp:GridView ID="GridView1" runat="server" AutoGenerateColumns="False" DataKeyNames="id" OnPageIndexChanging="GridView1_PageIndexChanging" OnRowDeleting="GridView1_RowDeleting" BorderWidth="2px" marginspace="5" CssClass="grid2 table table-striped table-bordered table-hover" BorderColor="Salmon" ItemStyle-Width="50" CellSpacing="6" CellPadding="6">

<Columns>

<asp:BoundField DataField="id" HeaderText="id" InsertVisible="False" ReadOnly="True" SortExpression="id" />

<asp:BoundField DataField="name" HeaderText="name" SortExpression="name" />

<asp:BoundField DataField="username" HeaderText="username" SortExpression="username" />

<asp:BoundField DataField="email" HeaderText="email" SortExpression="email" />

<asp:BoundField DataField="password" HeaderText="password" SortExpression="password" />

<asp:BoundField DataField="phone" HeaderText="phone" SortExpression="phone" />

<asp:BoundField DataField="date_added" HeaderText="date_added" SortExpression="date_added" />

<asp:CommandField ShowDeleteButton="true" />

</Columns>

<EditRowStyle BackColor="#2461BF" />

<FooterStyle BackColor="red" Font-Bold="True" ForeColor="White" />

<HeaderStyle BackColor="red" Font-Bold="True" ForeColor="White" />

<PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />

<RowStyle BackColor="#EFF3FB" />

<SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />

<SortedAscendingCellStyle BackColor="#F5F7FB" />

<SortedAscendingHeaderStyle BackColor="#6D95E1" />

<SortedDescendingCellStyle BackColor="#E9EBEF" />

<SortedDescendingHeaderStyle BackColor="#4870BE" />

</asp:GridView>