Adding Dropdown list

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hi all,

i am working on creating specific number of drop down list depending on number inputs by user. i had textbox(where user input number like 2) and button that create drop down list (in this case 2 dropdown lists). as below

C#

for (int i = 0; i <= Convert.ToInt16(DropDownList2.SelectedValue); i++)
{

    DropDownList dp = new System.Web.UI.WebControls.DropDownList();
    dp.ID = "ClRepList" + i;
    dp.AutoPostBack = true;
    dp.Height = 24;
    dp.Width = 102;
    dp.DataTextField = "PName";
    dp.DataValueField = "PName";
    dp.DataSource = return_data_table();
    dp.DataBind();
    ClientRepInfo.Controls.Add(dp);
}

now i want to read values from these lists to save values in database . as below

C#

protected void Button1_Click(object sender, EventArgs e)
{
    string[] Path=new string[5];
    ContentPlaceHolder MainCont =Page.Master.FindControl("MainContent") as ContentPlaceHolder;
    for (int k = 0; k <= 4; k++)
    {
        Panel Dpanel = (Panel)MainCont.FindControl("ClientRepInfo") as Panel;
        DropDownList drp = (DropDownList)Dpanel.FindControl("ClRepList" + k);
            if (drp != null)
            //  if (MainCont.FindControl("ClRepList" + k) != null)
            {
                Path[k] = drp.SelectedValue;
            }        
    }

but this now work. when i put break point on DropDown drp it reads null value !!

any help please ...

Posted 9-Jun-15 0:32am

Badour alsamaraie

Updated 9-Jun-15 0:43am

Tomas Takac

v2

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sasanka sekhar panda · Answer 1 · 2015-06-09T00:54:00

Solution 1

C#

foreach ( Control ctrl in panel) {

if(ctrl is DropDownList)
{
 Path[k] = ctrl .SelectedValue;
//let me know if it is giving null value
}
    //    
    }

Posted 9-Jun-15 0:54am

sasanka sekhar panda

Updated 9-Jun-15 2:07am

v3

Comments

Badour alsamaraie 9-Jun-15 7:41am

i did this method but still drp value = Null

sasanka sekhar panda 9-Jun-15 8:09am

use ctrl instead of drp and see the value in ctrl.SelectedValue

Badour alsamaraie 10-Jun-15 3:50am

i did what you told me but still the same error, ctrl do not dropdown list that created dynamically each time page is reload

F-ES Sitecore · Answer 2 · 2015-06-09T00:55:00

Solution 2

You need to create the dropdowns on every postback, they won't be recreated automatically.

Posted 9-Jun-15 0:55am

F-ES Sitecore

Comments

Badour alsamaraie 9-Jun-15 7:14am

sorry, what you mean?

F-ES Sitecore 9-Jun-15 8:04am

In the Page_Load event you have to create your DropDownList controls again and give them the same ID values.