Date Range Formula - crystal-reports

Question

Page1:
From Date: TXTBOX1 To Date: TXTBOX2
BTNSUBMIT-CLICK
{
server.transfer("page2.aspx");
}
Page 2:
if (PreviousPage != null)
{
TextBox txt1 = PreviousPage.FindControl("TXTBOX1") as TextBox;
TextBox txt2 = PreviousPage.FindControl("TXTBOX2") as TextBox;
if (txt1.Text.Length != 0 && txt2.Text.Length != 0)
{
ReportDocument cryRpt = new ReportDocument();
cryRpt.Load("MyReport.rpt");
ParameterFieldDefinitions crParameterFieldDefinitions;
ParameterFieldDefinition crParameterFieldDefinition;
ParameterValues crParameterValues = new ParameterValues();
ParameterDiscreteValue crParameterDiscreteValue = new
ParameterDiscreteValue();
crParameterDiscreteValue.Value = txt1.Text + txt2.Text;
crParameterFieldDefinitions =
cryRpt.DataDefinition.ParameterFields;
crParameterFieldDefinition =
crParameterFieldDefinitions["MyParameter"];
crParameterValues = crParameterFieldDefinition.CurrentValues;
crParameterValues.Clear();
crParameterValues.Add(crParameterDiscreteValue);
crParameterFieldDefinition.ApplyCurrentValues(crParameterValues);
CrystalReportViewer1.ReportSource = cryRpt;
}
}
Formula In Formula Editor:
{Command.Date} >= {?MyParameter} and {Command.Date} <= {?MyParameter}
It works fine If report is displayed for single date. Not for Date Range.
Any Suggestions? Where i am wrong in formula / code ???

Answer 1

You should pass the date fields as separate parameters, and reference them in your Formula Editor like this:
{Command.Date} >= {?ParamDateFrom} and {Command.Date} <= {?ParamDateTo}

Answer 2

Use a ParameterRangeValue instead of a ParameterDiscreteValue, and set the StartValue and EndValue properties to your start and end dates.
Update:
Here's some sample code that worked on a test report:
ParameterFieldDefinitions paramDefinitions = report.DataDefinition.ParameterFields;
ParameterFieldDefinition paramDefinition = paramDefinitions["DateRange"];
ParameterValues paramValues = paramDefinition.CurrentValues;
ParameterRangeValue rangeValue = new ParameterRangeValue();
rangeValue.StartValue = new DateTime(2010, 10, 31);
rangeValue.EndValue = new DateTime(2010, 12, 15);
paramValues.Add(rangeValue); ;
paramDefinition.ApplyCurrentValues(paramValues);
Make sure that your MyParameter is a range value, and that the select statement in Crystal is dateField = {?MyParameter}