/= Operator (C# Reference) 

The division assignment operator.

Remarks

An expression using the /= assignment operator, such as

x /= y

is equivalent to

x = x / y

except that x is only evaluated once. The / operator is predefined for numeric types to perform division.

The /= operator cannot be overloaded directly, but user-defined types can overload the / operator (see operator). On all compound assignment operators, overloading the binary operator implicitly overloads the equivalent compound assignment.

Example

// cs_operator_division_assignment.cs
using System;
class MainClass
{
    static void Main() 
    {
        int a = 5;
        a /= 6;
        Console.WriteLine(a);
        double b = 5;
        b /= 6;
        Console.WriteLine(b);
    }
}

Output

0
0.833333333333333

See Also

Reference

C# Operators

Concepts

C# Programming Guide

Other Resources

C# Reference