Environment Class C#

C#  > System > Environment Class

Environment class is used to retrieve/change information about environment variable settings, command line arguments, call stack.

Methods:

• SetEnvironmentVariable

Properties:

• UserName
• MachineName

Delete directory C#

C# > Files > Directory > Delete

Deletes the specified directory.

Example

Deletes the specified directory and any subdirectories and 

files in the directory.

System.IO.Directory.Delete(@"c:\Temp\", true);

How to get if is Runtime or Design Mode VB.net

VB.NET > Control > DesignMode

DesignMode returns true is a control is being used in the context of a designer. 

Example:

If Me.DesignMode Then
      Return
End If

Typeof C# example

C# > Keywords > typeof

Obtains the System.Type object for a type.

Example:

Type type = typeof(T);

• How to get the type of T from a generic List
• Reflection Example

SerialPort Class Example

C# > IO  > Ports > SerialPort

SerialPort controls a serial port file resource. 

Example

1. Gets all serial port names for the current computer.

List<String> serialPorts = new List<String>();

foreach (String portName in System.IO.Ports.SerialPort.GetPortNames())

{

  serialPorts.Add(portName);

}

System.IO.Ports Namespace C#

C# > IO  > Ports

System.IO.Ports contains classes for controlling serial port.

• SerialPort

CAST SQL Server Example

SQL Server > Built-in Functions > CAST

CAST converts an expression of one data type to another.

CAST ( expression AS data_type )

Examples

• String to number
• Number to date
• Date only - no time