This function returns a Boolean value that indicates whether an expression contains no valid data (Null).
Syntax:IsNull(Value)
The required Value argument is a Variant containing a value or string value. IsNull returns True if the “Value” is Null; otherwise, IsNull returns False.
Example:
Textbox2.Value=IsNull(Textbox1.Value)
Textbox1.Value=”India”
The function will return false.