using System;

using System.Windows.Forms;

using CrystalDecisions.CrystalReports.Engine;

using CrystalDecisions.Shared;



namespace WindowsApplication1

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }



        private void button1_Click(object sender, EventArgs e)

        {

            ReportDocument cryRpt = new ReportDocument();

            cryRpt.Load("PUT CRYSTAL REPORT PATH HERE\CrystalReport1.rpt");



            ParameterFieldDefinitions crParameterFieldDefinitions ;

            ParameterFieldDefinition crParameterFieldDefinition ;

            ParameterValues crParameterValues = new ParameterValues();

            ParameterDiscreteValue crParameterDiscreteValue = new ParameterDiscreteValue();



            crParameterDiscreteValue.Value = textBox1.Text;

            crParameterFieldDefinitions = cryRpt.DataDefinition.ParameterFields;

            crParameterFieldDefinition = crParameterFieldDefinitions["Customername"];

            crParameterValues = crParameterFieldDefinition.CurrentValues;



            crParameterValues.Clear();

            crParameterValues.Add(crParameterDiscreteValue);

            crParameterFieldDefinition.ApplyCurrentValues(crParameterValues);



            crystalReportViewer1.ReportSource = cryRpt;

            crystalReportViewer1.Refresh(); 



        }

    }

}