How to put a string in a Selection Formula in Crystal Reports?

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ASP.NET

CrystalReports

I have a Selection Formula in the code behind the form that has the crystalreportviewer on it. I am trying to display a different report for each user when they login. When a user logs in the session starts. The session goes by their INST_ID. Right now when a user is logged on and clicks the print button a print preview pops up and shows the report. The report that is displayed is not the report for that user. It is showing the report of another user. Is there a way to filter the reports by the users INST_ID. So when they log on and click print it will display the preview of the report for that user?

Here is my code behind for the crystalreortviewer:

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 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)
        {
            CrystalReportViewer1.Visible = true;
            ReportDocument crystalReport = new ReportDocument();
            crystalReport.Load(Server.MapPath("~/Reports/ReportA.rpt"));
            crystalReport.SetDatabaseLogon
            ("Admin", "master22", @"SQL", "Hot");
            CrystalReportViewer1.ReportSource = crystalReport;
            CrystalReportViewer1.SelectionFormula = "{COCINST.inst_id} = '" + Session["inst_id"].ToString() + "'";
        } 
    }
}

This is the error that I get when I click on the print button:

A number is required here. Details: errorKind Error in File FormAReport {F1AAC878-E2B7-4104-BE51-B9CC0023DD43}.rpt: Error in formula Record Selection: '{TableCOCINST.INST_ID} = '10960'' A number is required here. Details: errorKind

I have no Selection Formula in CR.