Set default values to static parameters on crystal report viewer 13 using C#

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;

}