GridView错误时，我试图读取，显示项目信息从SQL Server

Question

我得到这个错误:

编译错误描述:在编译服务此请求所需的资源期间发生错误。请查看以下具体的错误细节，并适当修改您的源代码。

编译器错误消息:CS1061: 'updateform_aspx'不包含'GridView1_SelectedIndexChanged'的定义，并且没有扩展方法'GridView1_SelectedIndexChanged'接受类型'updateform_aspx'的第一个参数可以找到(您是否缺少using指令或汇编引用?)

源错误:

Line 49:                 </div>
Line 50:             </div>
Line 51:         <asp:GridView ID="GridView1" runat="server" OnSelectedIndexChanged="GridView1_SelectedIndexChanged">
Line 52:         </asp:GridView>
Line 53:     </form>

这是我试图显示GridView信息的地方:

SqlConnection con = new SqlConnection(@"Data Source=DESKTOP-62V61RTSQLEXPRESS; Initial Catalog =ShopOnlineDB; Integrated Security=True;");
con.Open();
SqlCommand cmd = new SqlCommand("Select * from Master.Items", con);
SqlDataAdapter dat = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
dat.Fill(dt);
GridView1.DataSource = dt;

Answer 1

只需将此添加到cs文件中的代码

protected void GridView1_SelectedIndexChanged (object sender, EventArgs e)
{
// you code
}