Verbatim string literal does not require the use of escape characters to define special characters. Instead, any information in the source code, including new lines, is included in the string. To define a string literal an @ symbol is placed before the opening quotation mark. Verbatim string literals are often used [...]

ASP.NET Panel ScrollBars Property
Definition and Usage
The ScrollBars property is used to set or return the position and visibility of scroll bars in the Panel control.
Note:
If you want to set the vertical scrollbar set the height of the panel to fixed height.
If you want to set the horizontal scrollbar set the widht of the panel [...]