How to clear Dropdownlist with updatepanel in c#?

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Hi,
I have drodownlist,checkbox with auto postback in Update panel.
Ex

ASP.NET

<asp:updatePanel id="UPD1" runat="Server" UpdateMode="Conditional">
<asp:checkbox id="chk1" runat="server" autopostback="True" OnCheckedChanged="chkAllView_CheckedChanged" />
<asp:dropdownList id="ddl1" runat="server"/>

C#

Protected void Page_Load()
{
  if(!IsPostBack)
{
   DataSet Objds1 = ;

  ddl1.dataSource =Objds1;
  ddl1.databind();

}

}

Protected void chk1_CheckedCObject o,sender e)
{
 If(Chk1.Checked){
  ddl.Items.Clear();}
}

Dropdownlist items is not clear when I click Checkbox.
Please let me know the for Solutions.

Posted 10-Nov-14 18:18pm

24983

Updated 10-Nov-14 18:20pm

DamithSL

v2

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DamithSL 11-Nov-14 0:28am

debug your application and check when you check chk1 whether your application hit on chkAllView_CheckedChanged event or not

24983 11-Nov-14 0:35am

Event is triggered and but not clear dropdownlist

praveenagarkar 11-Nov-14 0:50am

have you put your checkbox and dropdownlist inside of content template of update panel??? and also script manager in the page??

3 solutions

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praveenagarkar · Answer 1 · 2014-11-10T18:53:00

This is how i have used, its working for me.....

XML

<div>
       <asp:ScriptManager ID="ScriptManager1" runat="server">
       </asp:ScriptManager>
       <asp:UpdatePanel ID="UpdatePanel1" runat="server">
           <ContentTemplate>
               <asp:CheckBox ID="chk1" runat="server" AutoPostBack="True" OnCheckedChanged="chkAllView_CheckedChanged" />
               <asp:DropDownList ID="ddl1" runat="server" />
           </ContentTemplate>
       </asp:UpdatePanel>
   </div><pre lang="cs">

protected void Page_Load(object sender, EventArgs e)
      {
          if (!IsPostBack)
          {
              List<string> lst = new List<string>();
              lst.Add("praveen");
              lst.Add("nanda");
              lst.Add("pradeep");
              ddl1.DataSource = lst;
              ddl1.DataBind();
          }

      }

      protected void chkAllView_CheckedChanged(object sender, EventArgs e)
      {
          if (chk1.Checked)
          {
              ddl1.Items.Clear();
          }
      }</pre>

C#

vinuvasahanponniah · Answer 2 · 2014-11-10T18:38:00

Solution 1

XML

<asp:DropDownList ID="DropDownList1"  Width="150"  runat="server"  AutoPostBack="true">
    </asp:DropDownList>

Posted 10-Nov-14 18:38pm

vinuvasahanponniah

Comments

24983 11-Nov-14 0:43am

no it does not change.. both controls in Update Panel

Pravuprasad · Answer 3 · 2014-11-10T18:45:00

XML

  <form id="form1" runat="server">
    <div>
<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager>
    <asp:updatePanel id="UPD1" runat="Server" UpdateMode="Conditional">
        <ContentTemplate>
            <br />
            <asp:CheckBox ID="chk1" runat="server" AutoPostBack="true" OnCheckedChanged="chkAllView_CheckedChanged" />
            <asp:DropDownList ID="ddl1" runat="server">
            </asp:DropDownList>          
        </ContentTemplate>
</asp:updatePanel>
    </div>
    </form>

C#

protected void Page_Load(object sender, EventArgs e)
        {
            if(!IsPostBack)
            {
                DataSet ds ; //set dataset values here
                ddl1.DataSource=ds;
                ddl1.DataBind();
            }
        }

        protected void chkAllView_CheckedChanged(object sender, EventArgs e)
        {
            if(chk1.Checked)
                ddl1.Items.Clear();
        }

Modify as above.

How to clear Dropdownlist with updatepanel in c#?

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