i create a crystal report and works fine but my problem is to pass textbox value to crystal report header

To Generate report i use two date time picker to get the report between two date my problem is to print out this two date on crystal report header 

like 
 report From 'txtfrom.text' To 'txtto.text'

here are my code

```
protected void Button2_Click1(object sender, EventArgs e)
{
    SqlConnection cnn = new SqlConnection("Data Source=YCC-DB-2K8;Initial Catalog=yccwebportal;User ID=sa;Password=p@ssw0rd");
    string sql = "select * from View_EQtype where Purchase_date between '"+ txtfrom.Text + "'AND'" + txtto.Text+"'";
    DataSet ds = new DataSet();

    SqlCommand cmd = new SqlCommand(sql, cnn);
    cmd.CommandType = CommandType.Text;
    SqlDataAdapter adp = new SqlDataAdapter(cmd);
    adp.Fill(ds, "View_EQtype");
    cnn.Open();
    ReportDocument myReportDocument;
    myReportDocument = new ReportDocument();
    myReportDocument.Load("C:/inetpub/wwwroot/yenwebportal/EQTypeReport.rpt");
    myReportDocument.SetDataSource(ds);
    myReportDocument.SetDatabaseLogon("sa", "p@ssw0rd");
    CrystalReportViewer1.ReportSource = myReportDocument;
    CrystalReportViewer1.DisplayToolbar = true;
    CrystalReportViewer1.ToolPanelView = CrystalDecisions.Web.ToolPanelViewType.None;   
}

```