Environment variables in C#

To get an environment variable in C#, you can use the Environment.GetEnvironmentVariable method. It takes the name of the variable as a string and returns its value as a string. Here's an example:

string path = Environment.GetEnvironmentVariable("PATH");
Console.WriteLine(path);

To set an environment variable in C#, you can use the Environment.SetEnvironmentVariable method. It takes the name of the variable and its value as strings. Here's an example:

Environment.SetEnvironmentVariable("MY_VAR", "my_value");

Note that changes made to environment variables are process-specific and do not affect the system-wide environment variables.

C# get environment variable value: Getting the value of an environment variable in C#.
```
string variableValue = Environment.GetEnvironmentVariable("YourVariableName");
```
Setting environment variables in C#: Setting the value of an environment variable in C#.
```
Environment.SetEnvironmentVariable("YourVariableName", "YourVariableValue");
```

Accessing system environment variables in C#: Accessing system-level environment variables in C#.

string systemPath = Environment.GetEnvironmentVariable("Path", EnvironmentVariableTarget.Machine);

Environment variable substitution in C#: Performing environment variable substitution in C#.

string pathWithVariable = $"YourPath;{Environment.GetEnvironmentVariable("YourVariableName")}";

Using Environment.GetEnvironmentVariables in C#: Using Environment.GetEnvironmentVariables to retrieve all environment variables in C#.
```
var allVariables = Environment.GetEnvironmentVariables();
```
Get specific environment variable in C#: Getting the value of a specific environment variable in C#.
```
string specificVariableValue = Environment.GetEnvironmentVariable("YourVariableName");
```

Reading and modifying environment variables in C#: Reading and modifying environment variables in C#.

// Reading
string variableValue = Environment.GetEnvironmentVariable("YourVariableName");

// Modifying
Environment.SetEnvironmentVariable("YourVariableName", "NewValue");

C# getenv equivalent for environment variables: Equivalent of getenv in C# for retrieving environment variable values.
```
string variableValue = Environment.GetEnvironmentVariable("YourVariableName");
```

Environment variable case sensitivity in C#: Understanding environment variable case sensitivity in C#.

// Case-sensitive retrieval
string variableValue = Environment.GetEnvironmentVariable("YourVariableName");

// Case-insensitive retrieval (if needed)
string variableValueIgnoreCase = Environment.GetEnvironmentVariable("YourVariableName", EnvironmentVariableTarget.Process);