Unable to get values of dynamically created controls C#

Question

1.00/5 (2 votes)

See more:

I have created dynamic controls on button click and I'm not able to retrieve values of dynamically created controls. I am getting values of dynamic controls inside a panel.

pnlDepartment is the Panel ID.

The strDDLValue has only first dropdown values and when it loops for the second time it still takes the first dropdown values and unable to get dynamic control values.

Please correct me if I'm making a mistake somewhere.

What I have tried:

Code:

protected void btnValues_Click(object sender, EventArgs e)
    {
            string strDDLValue = string.Empty;
            foreach (DropDownList ddl in pnlDepartment.Controls.OfType<DropDownList>())
            {
                strDDLValue = ddlName.SelectedItem.Text + "," + ddlLocation.SelectedItem.Text;
            }
    }

Posted 7-Jan-18 20:34pm

vignesht50

Updated 25-Apr-18 22:48pm

Add a Solution

Comments

Kornfeld Eliyahu Peter 8-Jan-18 3:36am

1. Dynamically created controls must be re-created on each and every post-back (full or partial)
2. You provided us with far less information than needed!!!

ZurdoDev 8-Jan-18 8:14am

Peter is correct. We need to see more of the relevant code.

Anuragintit 10-May-19 8:23am

<asp:gridview id="GvList" runat="server" autogeneratecolumns="False" onrowdatabound="GvList_RowDataBound" showfooter="True">
<columns>

<asp:templatefield headertext="Measurement Center Id">
<itemtemplate>

<asp:label id="CenterId" runat="server" text="<%#Eval("CenterId") %>" enabled="false">

<headerstyle width="4%" horizontalalign="Center" cssclass="thead_cell">
<itemstyle horizontalalign="Center" width="4%">

<asp:templatefield headertext="Today Data">
<itemtemplate>

<asp:textbox id="txt_lastyearonDate_Rain" runat="server" text="<%#Eval("py_raintoday") %>" ondrop="return false;" onpaste="return false;"

autocomplete="off">

<controlstyle width="90%">
<headerstyle width="4%" horizontalalign="Center" cssclass="thead_cell">
<itemstyle horizontalalign="Center" width="4%">

<footertemplate>
<asp:label id="lbl_pytoday" runat="server" forecolor="Black" style="display:block; padding:0; text-align: center">

<asp:templatefield headertext="Select Type">
<itemtemplate>

<asp:dropdownlist id="ddl_type" runat="server">

<controlstyle width="100%">
<headerstyle width="3%" horizontalalign="Center" cssclass="thead_cell">
<itemstyle horizontalalign="Center" width="3%">

------------------------------------------------------------------------------------------------
Code Side

protected void GvList_DataBound(object sender, EventArgs e)
{
GridViewRow row = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal);

TableHeaderCell cell = new TableHeaderCell();
cell.Text = "Details";
cell.ColumnSpan = 3;
row.Controls.Add(cell);

cell = new TableHeaderCell();
cell.Text = "Year 2018";
cell.ColumnSpan = 4;
row.Controls.Add(cell);

cell = new TableHeaderCell();
cell.ColumnSpan = 4;
cell.Text = "Year 2019";
row.Controls.Add(cell);

cell = new TableHeaderCell();
cell.Text = "Others";
cell.ColumnSpan = 4;
row.Controls.Add(cell);

// row.BackColor = ColorTranslator.FromHtml("#3AC0F2");
GvList.HeaderRow.Parent.Controls.AddAt(0, row);
}

------------------------Submit click--------------------
foreach (GridViewRow row in GvList.Rows)

{
Label CenterId = (Label)row.FindControl("CenterId") as Label;
string CenterId_no = CenterId.Text;

DropDownList ddl = (DropDownList)row.FindControl("ddl_type") as DropDownList;
string dropdown_value = ddl.SelectedValue;

TextBox txt_lastyearonDate_Rain = (TextBox)row.FindControl("txt_lastyearonDate_Rain") as TextBox;

float py_ondte = float.Parse(txt_lastyearonDate_Rain.Text);

}

-----------------

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)

Vincent Maverick Durano · Answer 1 · 2018-01-09T19:40:00

Solution 1

Dynamically created controls should be re-created on each and every postbacks to persist them on the page. Also, dynamic control values can be accessed through Request.Forms collection. Check this reference for example: [Creating Dynamic DropDownList Controls in ASP.Net]

Posted 9-Jan-18 19:40pm

Vincent Maverick Durano