在asp.net页面中使用用户控件时出错 [英] error with using user control in asp.net page

问题描述

我正在使用用户控件并调用后面的代码。

当我调用用户控件驻留控件时，下拉列表选择已更改我写了这段代码来查找控件。但它显示错误，如将system.httmlcontrol.cell转换为系统.web.control





i二手代码为：

i am using using user control and calling to code behind.
when i was calling the user control reside control like drop down list selected changed i write this code to find the control . but it show error like converting error with system.httmlcontrol.cell to system .web.control


i used code is:

protected void ddlDept_SelectedIndexChanged(object sender, EventArgs e)
    { 

  DropDownList dd = (DropDownList)sender;
            string CtrlId = dd.ID;
            int g = Convert.ToInt32(dd.SelectedValue);
            Control cd = dd.Parent;
            UserControl uc = (UserControl)cd;
            DropDownList ddlEmp = (DropDownList)uc.FindControl("ddlEmp");
            DropDownList ddlClass = (DropDownList)uc.FindControl("ddlClass");
            DropDownList ddlDept = (DropDownList)uc.FindControl("ddlDept");
            int acadamic = Convert.ToInt32(Session["AcademicYear"]);
            int userid = Convert.ToInt32(Session["UserRoleId"]);


            DataSet ds = _objDal.getclass(Convert.ToInt32(ddlDept.SelectedValue),userid,acadamic);
            ddlClass.DataSource = ds;
            ddlClass.DataTextField = "ClassName";
            ddlClass.DataValueField = "es_id";
            ddlClass.DataBind();  
}

推荐答案

我即将回答这个问题，但OP已经评论过了。 :)添加这个来从未答复的列表中移动它。

I was about to answer this, but OP has commented. :) Adding this to move it from unanswered list.

引用：

好的我得到了解决方案

OK i got the solution

DropDownList ddl = (DropDownList)sender;
UserControl uc = (UserControl)ddl.NamingContainer;

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