Difference between !String.IsNullOrEmpty and !='' and !=null in C#

Hi Abhays,

Abhays says:

if (!string.IsNullOrEmpty(textbox.Text)) {

.........

}

 It is used to check whether the specified string is not null or an Empty string.  If string is null or an Empty then this statement will not execute.

Abhays says:

 if (Textbox.Text != "")

 {

 ....

 }

  It is used to check whether the specified string is not an Empty string. If string is an Empty then this statement will not execute.

Abhays says:

if (Textbox.Text != null)

 {

 ....

 }

   It is used to check whether the specified string is not null string. If string is null then this statement will not execute.