deleting particular row in giving gridview

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ASP.NET

.NET

Gridview

C#5.0

need help . i am deleting particular row in my grid
there is a delete button in my edititem template

<asp:TemplateField HeaderText="Edit">
                   <ItemTemplate>
                       <asp:Button ID="btnedit" runat="server" Text="Edit" />
                       <asp:Button ID="btnDelete" runat="server" Text="Detete" />
                   </ItemTemplate>
                   <EditItemTemplate>
                        <asp:Button ID="btnupdate" CommandName="update" runat="server" Text="Edit" />
                       <asp:Button ID="btncancel" CommandName="cancel" runat="server" Text="Detete" />
                   </EditItemTemplate>


;

and my c# codes are

protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
SqlConnection con = new SqlConnection("Data Source=.;Initial Catalog=master;Integrated Security=True");
SqlCommand cmd=new SqlCommand();
con.Open();

int idd = Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Values["id"].ToString());
Button delete = (Button)GridView1.Rows[e.RowIndex].FindControl("btncancel");


if(delete.CommandName=="caancel")
// int idd = Int32.Parse(GridView1.DataKeys[e.RowIndex].Values["id"].ToString());

cmd = new SqlCommand("delete from food where id="+idd, con);

cmd.ExecuteNonQuery();
con.Close();
GridView1.DataBind();

}


and i am getting this error
Exception Details: System.Web.HttpException: Multiple controls with the same ID 'lname' were found. FindControl requires that controls have unique IDs.

sir i want to know the reason why this error is coming and what i am missing in my codes. this is a learning experience so i request to you sir please help me i am a new student