deleting records in gridview

You can simply use GridView RowCommand and CommandArgument for the same.
Try out like this,

<asp:templatefield xmlns:asp="#unknown">
              <headertemplate>
                Delete
              </headertemplate>
              <itemtemplate>
                  <asp:imagebutton commandname="DeleteCommand" commandargument="<%# Eval(" id=" )%>" imageurl="/test.pmg">
                        ID="lnk" runat="server" />
              </asp:imagebutton></itemtemplate>
          </asp:templatefield>

and in codebehind

Protected Void Grid_RowCommand(object sender, GridViewEventArgs e)
{
 if(e.CommandName=="DeleteCommand") 
    {
 CheckBox cb= (CheckBox)e.Row.findControl("chkbox");
if(cb.Checked)      
     {
      DeletedRecord(e.CommandArgument);
     }
    }
}

Please check for the syntax.