Error : in DropDown list Selectindex is equal to -1

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C#

.NET

.NET4

Hi,

When we are updating the Dropdownlist from the Datatable, the value can not insert into the Dropdownlist it is showing blank only due to selected Index = -1

Kindly help me to resolve this issue.

During Update

ddlcountry.text = dtCountry[0]["Country"].Tostring();

from database dtCountry = 'America'

IN Dropdownlist Source

<asp:UpdatePanel ID="UpdatePanel4" runat="server">
   <ContentTemplate>
      <asp:DropDownList ID="ddlCountry" AutoPostBack ="true"
AppendDataBoundItems ="True" runat="server"
onselectedindexchanged="ddlCountry_SelectedIndexChanged"  Width="200px" >
      </asp:DropDownList>
   </ContentTemplate>
   <Triggers>
    <asp:AsyncPostBackTrigger ControlID ="ddlCountry"
   </Triggers>
</asp:UpdatePanel>