In C # | (bit or) and | (logical or) What is the difference?

These two tips are different.
| During bitwise OR operations, the bitwise OR operator calculates the result of all operation conditions and determines whether the result is true.
| During logical or operation, if a previous or subsequent operation is established, the following conditions are no longer operated. Directly true.

The same is true.
Use & for example.
Txtname is a textbox.
If (txtname! = NULL & txtname. Text! = "")
{}
And
If (txtname! = NULL & txtname. Text! = "")
{}
Different results will appear.
When txtname = NULL.
An error is reported for 2nd statements.
Because the txtname will be executed together for the first 2nd! = NULL and txtname. Text! = ""
Therefore, an error is reported for 2nd conditions.
And execute txtname In the first sentence! = False when null
The execution will not continue.