This is the tenth in a series of computer science video tutorials for beginners, about programming with Visual Basic.NET (VB.NET) in Visual Studio. In this lesson, you will be introduced to logical operators, in particular the OR operator. You will also learn how relational operators, including greater than, less than, greater or equal to and less than or equal to, can be used to perform complex tests in the condition clause of an IF statement. You will learn how to check if it is possible to convert text input into a number by means of the IsNumeric() function, and how to explicitly convert string data into an integer (known as casting) using the CInt() function. The importance of validating user input to ensure robust programs that don’t crash is also mentioned. Logical and relational operators are covered in more detail in the next video of this series.