error with using user control in asp.net page

Question

0.00/5 (No votes)

See more:

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:

C#

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();  
}

Posted 30-Sep-14 18:32pm

Member 10229796

Add a Solution

Comments

Suvabrata Roy 1-Oct-14 0:44am

In which line you getting this error? Are you using some kind of data grid?

Member 10229796 1-Oct-14 1:01am

UserControl uc = (UserControl)cd; in this line i get error like system.web.htmlcontrol.htmlcell to system.web.controls

Suvabrata Roy 1-Oct-14 1:24am

Where you place that drop down ?

You are accessing its parent but as per your Exception Message its a HtmlControl or most likely a table its not a Server Control that's why its throwing error.

Member 10229796 1-Oct-14 1:29am

in user control

Samatha Reddy G 1-Oct-14 1:25am

you are trying to call dropdowns which are there in usercontrol am i right?

Member 10229796 1-Oct-14 1:28am

yes

Samatha Reddy G 1-Oct-14 1:31am

can you please put once your client side code? i will tell you how to call user control dropdown in to our .aspx page.

Member 10229796 1-Oct-14 1:35am

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Globalization;
using GlobalizationandLocalization;
using System.Security.Cryptography;
using System.Text;
using System.Data.SqlClient;
using MINumericTextBoxControl;
using eWorld.UI;
using System.IO;
using System.Text.RegularExpressions;
using dpant;

public partial class Committees_CommitteeMembers : System.Web.UI.Page
{
MI.BLL.Committees _objBll=new MI.BLL.Committees();
readonly MI.ENT.Committees _objEnt = new MI.ENT.Committees();
readonly MI.DAL.Committees _objDal = new MI.DAL.Committees();
readonly MI.BLL.Common _objCommon = new MI.BLL.Common();
protected int Permission; protected FullGridPager fullGridPager;
protected int MaxVisible = 0; public string confirm;
int x;
public int NoOfUserControls = 1;
protected void Page_Load(object sender, EventArgs e)
{
try
{

confirm = Resources.Resources.areyousure;
if (Session["UserRoleId"] == null)
{
Response.Redirect(FormsAuthentication.LoginUrl, false);
return;
}
else
{
Permission = _objCommon.CheckAccess(MI.BLL.AccessId.Modules.AccountGroup, Convert.ToInt32(Session["UserRoleId"]));
if (Permission == 0)
{
Response.Redirect("~/NoAccessPage.aspx", false);
return;
}
else
{

if (Page.IsPostBack)
{

if (Request.QueryString["Id"] != null)
{
int i = Convert.ToInt32(Request.QueryString["id"]);
//GetCommitteeName(i);

}

}
if (!IsPostBack)
{
ltlCount.Text = "1";
}
GetCommittee();

AddAndRemoveDynamicControls();

HdfCount.Value = ltlCount.Text.Trim();
int count = Convert.ToInt32(ltlCount.Text.Trim());
}
}

}
catch (Exception ex)
{
tblError.Visible = true;
lblExError.Text = ex.Message.ToString();
_objCommon.WriteError(ex.Message + ex.StackTrace);
}

}
public void GetCommittee()
{
DataSet ds = new DataSet();
ddlCommittee.Items.Clear();
ds = _objDal.GetCommitteeName();
ddlCommittee.DataSource = ds.Tables[0];
ddlCommittee.DataTextField = "MI_COMMITTEE_NAME";
ddlCommittee.DataValueField = "MI_COMMITTEE_ID";
ddlCommittee.DataBind();
ddlCommittee.Items.Insert(0, new System.Web.UI.WebControls.ListItem("Select", "0"));

}
//public void GetCommitteeName(int i)
//{
// DataSet ds = new DataSet();
// if (ds.Tables[0].Rows.Count > 0)
// {

// lblCommittee.Text = Convert.ToString(ds.Tables[0].Rows[0][0]);

// }
//}

private void AddAndRemoveDynamicControls()
{

Control c = GetPostBackControl(Page);
if ((c != null))
{
if (c.ID.ToString() == "lnkbtnAdd")
{
ltlCount.Text = Convert.ToString(Convert.ToInt16(ltlCount.Text) + 1);
int val = Convert.ToInt32(HiddenField1.Value) + 1;
HiddenField1.Value = val.ToString();
}
}
if ((c != null))
{
if (c.ID.ToString() == "delbtn")
{
ltlCount.Text = Co

Samatha Reddy G 1-Oct-14 1:41am

Hey am asking client side code..... i want the id of that usercontrol?

Member 10229796 1-Oct-14 2:02am

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="CommitteMember.ascx.cs"
Inherits="Committees_CommitteMember" %>
<%@ Register Assembly="NumericTextControl" Namespace="MINumericTextBoxControl" TagPrefix="cc1" %>
<table class="tborder" cellspacing="0" cellpadding="0" width="100%" border="0"
id="table">
<thead>
<tr id="trInfo">
<td class="tcat">
<asp:Image ID="Image2" runat="server" SkinID="spacer" Width="5px" Height="21px" meta:resourcekey="Image2Resource1" />
</td>
<td class="tcat" style="width: 100%">
<asp:Label ID="lblInfo" runat="server" Text="Select Catagery" Font-Bold="True"
meta:resourcekey="lblClassResource1">
</td>
</tr>
</thead>
<tbody>
<tr class="row1" id="trBtn">
<td align="right" style="width: 50%" valign="top">
<asp:Label ID="Label2" runat="server" Text="Select Member" Font-Bold="True">
</td>
<td style="width: 50%" align="left" valign="middle">
<asp:RadioButton ID="rbEmp" runat="server" Text="Employee" Font-Bold="true" GroupName="g"
TabIndex="1" AutoPostBack="true" OnCheckedChanged="rbEmp_CheckedChanged" />
<asp:RadioButton ID="rbStdnt" runat="server" Text="Student" Font-Bold="true" GroupName="g"
TabIndex="1" AutoPostBack="true" OnCheckedChanged="rbStd_CheckedChanged" />
<asp:RadioButton ID="rbOthers" runat="server" Text="Others" Font-Bold="true" GroupName="g"
TabIndex="1" AutoPostBack="true" OnCheckedChanged="rbOthers_CheckedChanged" />
</td>
</tr>
<tr>
<td class="contenttableborder" colspan="2">
<table border="0" cellpadding="3" cellspacing="1" width="100%">
<tr class="row1" id="tremptype" runat="server" visible="false">
<td class="row1">
<asp:Label ID="lblEmployee" runat="server">) Employee Name
</td>
<td class="row1">
<asp:DropDownList ID="ddlEmp" runat="server" >
<asp:ListItem Text="Select" Value="0">

<asp:RequiredFieldValidator ID="rqfEmployeeName" runat="server" ControlToValidate="ddlEmp"
InitialValue="0" Display="Dynamic" ErrorMessage="*" SetFocusOnError="True" ToolTip="Select Employee"
ValidationGroup="rqgroup">
</td>
</tr>
<tr class="row1" id="trDesig" runat="server" visible="false">
<td class="row1">
<asp:Label ID="lblDesig" runat="server" Text="Designation">
</td>
<td class="row1">
<asp:DropDownList ID="ddlDesig" runat="server" >
<asp:ListItem Text="Select" Value="0">

<asp:RequiredFieldValidator ID="rqDesig" runat="server" ControlToValidate="ddlDesig"
InitialValue="0" Display="Dynamic" ErrorMessage="*" SetFocusOnError="True" ToolTip="Select Designation"
>
</td>
</tr>
<tr class="row1" id="trRole" runat="server" visible="false">
<td class="row1">
<asp:Label ID="l

Samatha Reddy G 1-Oct-14 2:07am

Hey you are not using your user control in this page just you registered that's it.
using that prefix cc1 you need to call that user control.

Member 10229796 1-Oct-14 2:11am

OK i got the solution

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

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) 1-Oct-14 2:22am

Added one answer. Please accept so that it will be closed.

Thanks,
Tadit

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2014-09-30T20:21:00

Solution 1

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

Quote:

OK i got the solution

C#

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

Posted 30-Sep-14 20:21pm

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)