C# - Environment.SetEnvironmentVariable() Method with Example

In this tutorial, we will learn about the C# Environment.SetEnvironmentVariable() method with its definition, usage, syntax, and example. By Nidhi Last updated : March 30, 2023

Environment.SetEnvironmentVariable() Method

The Environment.SetEnvironmentVariable() method is used the set value of the environment variable.


void Environment.SetEnvironmentVariable(string var, string val);


  • var: Environment variable name
  • val: Value that we store into a variable

Return Value

It does not return any value.


  • System.Security.SecurityException
  • System.ArgumentNullException
  • System.ArgumentException

C# Example of Environment.SetEnvironmentVariable() method

The source code to demonstrate the use of SetEnvironmentVariable() method of Environment class is given below. The given program is compiled and executed successfully.

using System;
using System.IO;

class Sample {
  //Entry point of Program
  static public void Main() {
    string Var_Name = "VAR1";
    string Var_Value = "True";

    if (Environment.GetEnvironmentVariable(Var_Name) == null) {
      Environment.SetEnvironmentVariable(Var_Name, Var_Value);
      Console.WriteLine("Value stored in environment variable");
    } else {
      Console.WriteLine("Value already stored in environment variable");


Value stored in environment variable
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