Error in my Textbox on a web form

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ASP.NET

CrystalReports

Hello. I have a web form that has crystal report viewer on it and I added a textbox to the form also. When I run the form I get this text that appears in the textbox. It says this: "System.Web.UI.WebControls.TextBox". Why does this happen? I use the textbox to display the session ID that I want to make sure it will display what I need. Here is the code for that form.

using System;
using System.Collections.Generic;
using System.Collections;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using CrystalDecisions.Web;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.WebControls;
using CrystalDecisions.CrystalReports.Engine;
using CrystalDecisions.Shared;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Xml.Linq;
using System.Web.SessionState;


namespace SACSCOCLogin1._1
{
    public partial class ReportFormA : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

            TextBoxINST_ID.Text = Session["inst_id"].ToString();
            CrystalReportViewer1.Visible = true;
            //CrystalReportViewer1.Refresh();
            ReportDocument crystalReport = new ReportDocument();
            crystalReport.Load(Server.MapPath("~/Reports/ReportA.rpt"));
            crystalReport.SetDatabaseLogon
            ("Administrator", "losni", @"cocsql", "Password");
            CrystalReportViewer1.ReportSource = crystalReport;
            CrystalReportViewer1.SelectionFormula = "{TableCOCINST.LongName} = 'INST_ID' AND {TableCOCINST.STATE} = 'INST_ID' AND {TableCOCINST.CITY} = 'INST_ID'";
            //CrystalReportViewer1.SelectionFormula = "{TableFIN2013.inst_id} = '" + Session["inst_id"].ToString() + "'";
        }