Report Parameter validation in ssrs report

Question

I have created one SSRS report having begin date and end date. If I provide end date< start date it will execute the report as shown in the image

Answer 1

Click Report Menu then Report Properties.
Go to Code Tab and add similar code as per your requirement:

Function CheckDateParameters(StartDate as Date, EndDate as Date) as Integer
Dim msg as String
     msg = ""
     If (StartDate > EndDate)  Then
 msg="Start Date should not be later than End Date"
     End If
     If msg <> "" Then 
 MsgBox(msg, 16, "Report Validation")
 Err.Raise(6,Report)                    'Raise an overflow
     End If
End Function

And

Follow the Steps:

1.) Go the Report Parameters and add a parameter with the datatype is string.

2.) Check the Hidden checkbox and Allow blank value ckeckbox.

3.) From Default Values choose Non-Queried radio button and then press the FX button and paste this code.

=CODE.CheckDateParameters(.Value,.Value)

Then press OK.

See reference Link:

Easy Step by Step SSRS Parameter Validation Using Code & Conditional DataSet