How to retrive select value of dynamic dropdown inside placeholder controls in C#

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I want to get a selected value of Dynamic Control which is inside placeholder

The below code is how i have created dynamic dropdown controls

C#

string strQuery = "select distinct(TXT_BRANCH_NAME) from TBL_BRANCH_MASTER;";
            DataTable dt_data = new DataTable();
            dt_data = objdBConnection.getDataTableQuery(strQuery);
            DropDownList ddlBranchList = new DropDownList();
            if (dt_data.Rows.Count > 0)
            {
                int rowCount = dt_data.Rows.Count;
                string[] assetList = new string[rowCount];
                ddlBranchList.ID = "ddlBranchList";
                ddlBranchList.Items.Add(new ListItem("Select", ""));
                ddlBranchList.CssClass = "form-control form-control-line";
                for (int j = 0; j < rowCount; j++)
                {
ddlBranchList.Items.Add(new ListItem(dt_data.Rows[j]["TXT_BRANCH_NAME"].ToString(), dt_data.Rows[j]["TXT_BRANCH_NAME"].ToString()));
                }
               
                ddlBranchList.DataBind();
            }

What I have tried:

Here Below i m fetching selected value of dropdown

C#

string ddlBranch = "";

DropDownList ddlist = ((DropDownList)plcBranchddl.FindControl("ddlBranchList"));

ddlBranch = ddlist.SelectedValue.ToString();

but at last i m getting a null in ddllist dropdown references

Posted 20-May-20 6:40am

Member 14838600

Updated 20-May-20 8:07am

v3

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F-ES Sitecore · Answer 1 · 2020-05-20T07:47:00

You have to re-create your dynamic controls on postback

C#

protected void Page_Load(object sender, EventArgs e)
{
    DropDownList ddlBranchList = new DropDownList();
    ddlBranchList.ID = "ddlBranchList";
    ddlBranchList.Items.Add(new ListItem("Select", ""));
    ddlBranchList.CssClass = "form-control form-control-line";
    ddlBranchList.Items.Add(new ListItem("One", "1"));
    ddlBranchList.Items.Add(new ListItem("Two", "2"));
    ddlBranchList.Items.Add(new ListItem("Three", "3"));
    plcBranchddl.Controls.Add(ddlBranchList);
}

protected void btnSubmit_Click(object sender, EventArgs e)
{
    string ddlBranch = "";

    DropDownList ddlist = ((DropDownList)plcBranchddl.FindControl("ddlBranchList"));

    ddlBranch = ddlist.SelectedValue.ToString();
}