How to pass parameters to crystal report from multiple textboxes and datetimepicker in windows form?

using CrystalDecisions.Shared;

...private void ParamButton_Click(object sender, System.EventArgs e){

  // Create parameter objects  ParameterFields myParams = new ParameterFields(); 
 ParameterField myParam = new ParameterField();
  ParameterDiscreteValue myDiscreteValue = new ParameterDiscreteValue(); 
 // Set the ParameterFieldName to the name of the parameter  
// created in the Field Explorer  myParam.ParameterFieldName = "Country"; 
 // Add first country  myDiscreteValue.Value = "USA"; 
 myParam.CurrentValues.Add(myDiscreteValue); 
 // Reuse myDiscreteValue, and assign second country  myDiscreteValue = new ParameterDiscreteValue();
  myDiscreteValue.Value = "Netherlands";  myParam.CurrentValues.Add(myDiscreteValue); 
 // Add param object to params collection  myParams.Add(myParam); 
 // Assign the params collection to the report viewer  myCrystalReportViewer.ParameterFieldInfo = myParams; 
 // Assign the Report to the report viewer.  
// This method uses a strongly typed report, 
 // but other methods are possible as well.  
myCrystalReportViewer.ReportSource = MyReportObject;

}


and for more refer this link:
http://imar.spaanjaars.com/310/passing-multiple-parameters-to-a-crystal-report-programmatically


Thanks.