here the explanation
by default set complince and in language drop down is eng language
but when i change the item from drop down then language not getting correctly and set any other language why?
if i set post back is false then not affected ?

                  <asp:DropDownList ID="drpAuthType" runat="server" height="31px" CssClass="combobox" AutoPostBack="true" OnSelectedIndexChanged="drpAuthType_SelectedIndexChanged">
<asp:ListItem Text="Rainbow Compliance Recorder" meta:resourcekey="drpAuthTypeli1Resource1" Value="RecordingRepository"></asp:ListItem>
<asp:ListItem Text="Active Directory" meta:resourcekey="drpAuthTypeli2Resource1" Value="AD"></asp:ListItem>
<asp:ListItem Text="Azure Active Directory" meta:resourcekey="AzureActiveDirectory" Value="Azure"></asp:ListItem>
<asp:ListItem Text="Rainbow" meta:resourcekey="Rainbow" Value="RB"></asp:ListItem>

</asp:DropDownList>
code behind
protected void drpAuthType_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
if ((drpAuthType.SelectedValue == AuthenticationType.AD.ToString() || drpAuthType.SelectedValue == AuthenticationType.Azure.ToString() || drpAuthType.SelectedValue == AuthenticationType.RB.ToString()) && Convert.ToBoolean(Session[“IsEmailTemplateEnabled”]))
{
hlForgotPassword.Visible = false;
}
else if (drpAuthType.SelectedValue == “RecordingRepository” && Convert.ToBoolean(Session[“IsEmailTemplateEnabled”]))
{
hlForgotPassword.Visible = true;
}

      txtPassword.Attributes.Add("value", txtPassword.Text);

      ScriptManager.GetCurrent(Page).SetFocus(drpAuthType);

  }
  catch (Exception)
  {

      throw;
  }

}