Set SelectedValue of DropDownList from Database using C# in ASP.Net

 invoice.aspx:

<asp:DropDownList ID="lstCountryy" runat="server" Width="216px" Height="27px" AutoPostback="false">
</asp:DropDownList> 

dtInquiry is my Inquiry table in which country field is there and i am fetching the value from inquiry form to invoice form. i am not getting the selected value. It shows blank(""). I dont know what wrong with that.Any help will be highly appreciated.

        private void loadinvoicedetails()
	{
	    string queryStrLoadInq = "SELECT COMPANY,COUNTRY,EMAIL,CONTACT_NAME  FROM  CRM_INQUIRY_PERTICIPANT WHERE INQUIRY_ID=" + currInquiryId + " ";
            ClassDtBaseConnect clsDtResult = new ClassDtBaseConnect();
            DataTable dtInquiry = clsDtResult.GetDataTable(queryStrLoadInq);   
	    txtCompanyName.Text = dtInquiry.Rows[0]["company"].ToString();//Fipkart company
            txtEmail.Text = dtInquiry.Rows[0]["email"].ToString();//abc@gmail.com
            txtContactPerson.Text = dtInquiry.Rows[0]["contact_name"].ToString(); //rahul          
            lstCountryy.SelectedValue = dtInquiry.Rows[0]["country"].ToString();//Here selected value shows blank            
	}