Validation (ASP.NET): attribute 'onclick' is not a valid attribute of element 'dropdownlist'.

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i try this dropdown list with onclick

What I have tried:

ASP.NET

<asp:DropDownList ID="DropDownList1" runat="server" 
    onselectedindexchanged="DropDownList1_SelectedIndexChanged"
     onclick="Loadchart();">

but this shows error
Validation (ASP.Net): Attribute 'onclick' is not a valid attribute of element 'DropDownList'.

where as i call this dropdown on page load

C#

DropDownList1.DataSource = getyear();
               DropDownList1.DataTextField = "year";
               DropDownList1.DataValueField = "year_id";
               DropDownList1.DataBind();

When i build this shows error any solution

Posted 8-May-16 21:39pm

super_user

Updated 9-May-16 0:35am

Santosh Kokatnur

v2

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Karthik_Mahalingam · Accepted Answer · 2016-05-08T21:48:00

Remove that event from mark up and add bind the event from code behind during page
load.
however, onchange event should helpful in case of Dropdownlist events. anyhow its upto your requirement.

ASP.NET

<asp:dropdownlist id="DropDownList1" runat="server" >
         OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged"></asp:dropdownlist>

CS

C#

protected void Page_Load(object sender, EventArgs e)
      {
          if (!IsPostBack)
          {
              DropDownList1.Attributes.Add("onclick", "Loadchart();");
          }
      }