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REST APIs with .NET and C# REST APIs with .NET and C# is a ASP.NET makes it easy to build services that reach a broad range of clients, including browsers and mobile devices. With ASP.NET you use the same framework and patterns to build both web pages and services, side-by-side in the same project. What you want to learn REST APIs 

CustomValidator in Asp.net Text box Control:

RegularExpressionValidator in Asp.net Text box Control:

Use of Required Field validator in asp.net