What is the use of using keyword in C#

Question

Niraj Kumar Mishra · Answer

We can use using keyword in C# program in to Place.

Place 1: Generally when you want to add any namespace in your program then it is useful like:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

Place 2: Second we use using keyword when you want to close ( destroy ) any object connection automatically then it is very useful like :

 using (SqlConnection con = new SqlConnection(//connection string)
{
using (SqlCommand cmd = new SqlCommand(storedProcname, con))
{
try{
    con.open();
//data reader code
}
catch
{
}
}
}

it close the SqlConnection Automatically....

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What is the use of using keyword in C#

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