How to avoid exception of request querystring in vb.net if parameter is not passed

Question

If the parameter variable is not passed then this code throws an exception of "Conversion from string "" to type 'Date' is not valid."

this is my code.

 Public Shared ReadOnly Property Request_projectStartDate() As Date

        Get

            Dim _value As String = Nothing



            If Not HttpContext.Current.Request.QueryString("projectStartDate") Is Nothing Then

                _value = HttpContext.Current.Request.QueryString("projectStartDate").ToString()

            End If



            Return CDate(_value)

        End Get

    End Property

Answer 1

You can check what @Massimiliano has reported and one more check

If Request.QueryString.HasKeys() Then

   // Check for specified querystrings...
   If Not String.IsNullOrEmpty(Request.QueryString("projectStartDate")) Then
       // Your logic
   End If

End If

How to avoid exception of request querystring in vb.net if parameter is not passed

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