When we create a
.cs file means code file class is automatically create. That .cs file means
class has default usings for namespace.
using
System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using
System.Web.UI.WebControls;
We don't use all namespaces in that class so
we have to remove unused namespaces from file. We can remove namespace
manually but it takes time and need full knowledge of class library so we
can use Visual Studio .
Step 1: Right Click in .cs File.
Step 2: Move on Organize usings.
Step 3: Click on Remove Unused Usings.
After that we
have only those namespaces in the file these are using.