Using Statement in C#

Hi manikandan482,

Using is not used for open conncetion.

Using statement ensures that, an object that implements the IDisposable interface is properly disposed.

The Dispose method is automatically called when the code leaves the using block.

When the control leaves the block of the using statement, IDisposable instance is disposed even if an exception occurs within the block.

Example:

using (SqlCommand cmd = new SqlCommand())
{

}

For more details refer using statement.