Validate QueryString varialbe in correct way.

Use below given code to validate querystring variables.

Private Function ValidateQueryString() As Boolean
        If Request.QueryString("name") <> Nothing Then
            If Request.QueryString("name").ToString() <> String.Empty Then
               Return True
            End If
        Else
            Return False
        End If
End Function

This code first checks for existence of querystring variable "name". If it exists, then it's check for it's value. As sometimes it's quite possible that the querystring variable is present but with no value. Something like this : www.abc.com/default.aspx?name=

Over here no value is assigned to name variable. So we need to check it's value also.

Thanks,
Virendra Dugar