#region is used to expand or cllapse when using the outlining feature of the visual studio code editor.
Syntax: #region name
Note:
A #Region block must be terminated with a #endregion directive
A #region block cannot overlap with #if block, However, can be nested in a a #if block and a #if block can be nested in a #region block.
Example:
#region Addition
public int add(int a, int b){
return a+b ;
}
#endregion
