BinaryReader and BinaryWriter are the classes that are used to read and write into a binary file. These are just like C# StreamReader and StreamWriter except here we read and write to a binary file.

This class in C# is used to read binary information from a file. This class is present in System.IO namespace.

The BinaryReader contains the following commonly used methods.

## C# BinaryWriter Class

The BinaryWriter class is used to write binary information into a stream. This class is present in System.IO namespace.

The BinaryWriter contains the following commonly used methods.

## Example: C# program for BinaryReader and BinaryWriter classes

Output: After the execution of the above program a new file sample.dat file will be created and the information written on it will be displayed on the screen.

`String : This is Simple2code.com.`
`Double : 23.123Boolean : TrueInteger : 45`

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