SELECT INDEX of drop down list

I'm trying to automatically select the drop down list item....keeps bombing out

 System.NullReferenceException: Object reference not set to an instance of an object
private void usp_CheckNamedUsers_Selected(Object sender, SqlDataSourceStatusEventArgs e)
      {
		// grab our return value from the stored procedure
        string str_Test = e.Command.Parameters["@bit_ReturnValue"].Value.ToString();

        // if this user doesn't exist in the DB direct them to the new user page
        if(str_Test != "True")
          Response.Redirect("/Recruitment/UserInformation.aspx");

        if (!IsPostBack)
        {
            DataView dvw_DataView_usp_Requisition_SELECT = (DataView)usp_Requisition_SELECT.Select(DataSourceSelectArguments.Empty);
            foreach (DataRowView drv_DataRowView in dvw_DataView_usp_Requisition_SELECT)
            {
                // textboxes and labels  
                // cal_RequestDate.Text           = drv_DataRowView["dtm_RequestDate"].ToString();
                txt_JobTitleQueued.Text = drv_DataRowView["vch_JobTitleID"].ToString();
                txt_HiringManagerQueued.Text = drv_DataRowView["int_L1NamedUserID"].ToString();
                txt_LocationQueued.Text = drv_DataRowView["int_LocationID"].ToString();
                txt_PayTypeQueued.Text = drv_DataRowView["int_PositionType"].ToString();
                txt_Split1PIDQueued.Text = drv_DataRowView["vch_PIDSplit1"].ToString();
                txt_Split2PIDQueued.Text = drv_DataRowView["vch_PIDSplit2"].ToString();
                txt_Split3PIDQueued.Text = drv_DataRowView["vch_PIDSplit3"].ToString();
                txt_Split4PIDQueued.Text = drv_DataRowView["vch_PIDSplit4"].ToString();
                txt_FundSourceSplit1.Text = drv_DataRowView["vch_PercentSplit1"].ToString();
                txt_FundSourceSplit2.Text = drv_DataRowView["vch_PercentSplit2"].ToString();
                txt_FundSourceSplit3.Text = drv_DataRowView["vch_PercentSplit3"].ToString();
                txt_FundSourceSplit4.Text = drv_DataRowView["vch_PercentSplit4"].ToString();
                txt_RecruitmentDelayed.Text = drv_DataRowView["vch_RecruitmentDelayed"].ToString();
                txt_RecruitmentUnapproved.Text = drv_DataRowView["vch_RecruitmentUnapproved"].ToString();
                txt_HowWorkAccomplished.Text = drv_DataRowView["vch_HowWorkAccomplished"].ToString();


            }
        }
        ddl_DepartmentLocation.Items.FindByValue(txt_LocationQueued.Text.ToString()).Selected = true;
      }


 <asp:DropDownList 
                            ID="ddl_DepartmentLocation"
                            Width="225px"
                            DataSourceID="usp_Location_SELECT"
                            DataTextField="vch_Location"
                            DataValueField="int_LocationID"
                            TabIndex="6"
                            ToolTip="Select the location that this position will be based at from the list."
                            runat="server">
                          </asp:DropDownList>

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gdspeareAsked:
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gdspeareAuthor Commented:
Answer:

  ddl_DepartmentLocation.SelectedIndex = Convert.ToInt16(txt_LocationQueued.Text);
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gdspeareAuthor Commented:
converted text box value to int.
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