How to Create a GUID in C# .NET

What is a GUID For those of you who don't know, a GUID (pronounced goo'id - Globally unique identifier) is a 128-bit integer that can be used to uniquely identify something. You may store users or products in your database and you want somehow uniquely identify each row in the database. A common approach is to create a autoincrementing integer, another way would be to create a GUID for your products. How to create a GUID in C# The GUID method can be found in the System namespace. The GUID method System.Guid.NewGuid() initializes a new instance of the GUID class. There are also a few overloads available for those of you who want the GUID formatted in a particular fashion. The following live sample will output the GUID generated, the source code is also below. Click For Live Demo Response.Write(@" System.Guid.NewGuid().ToString() = " + System.Guid.NewGuid().ToString()); Response.Write(@" System.Guid.NewGuid().ToString(""N"") = " + System.Guid.NewGuid().ToString("N")); Response.Write(@" System.Guid.NewGuid().ToString(""D"") = " + System.Guid.NewGuid().ToString("D")); Response.Write(@" System.Guid.NewGuid().ToString(""B"") = " + System.Guid.NewGuid().ToString("B")); Response.Write(@" System.Guid.NewGuid().ToString(""P"") = " + System.Guid.NewGuid().ToString("P"));