Get current user from C# Application

How to get the current username in .NET:

You can use the Environment.UserName property to get the current username in .NET. Here is an example:

string userName = Environment.UserName;
Console.WriteLine("Current username: " + userName);

This will output the current username.

How to get the current user in ASP.NET MVC:

You can use the User.Identity.Name property to get the current user in ASP.NET MVC. Here is an example:

string userName = User.Identity.Name;
ViewBag.UserName = userName;

This will set the ViewBag.UserName property to the current user's name.

Get current user's email address behind a Windows domain in C#:

You can use the UserPrincipal class from the System.DirectoryServices.AccountManagement namespace to get the email address of the current user in a Windows domain. Here is an example:

using System.DirectoryServices.AccountManagement;

PrincipalContext principalContext = new PrincipalContext(ContextType.Domain);
UserPrincipal userPrincipal = UserPrincipal.FindByIdentity(principalContext, Environment.UserName);
string emailAddress = userPrincipal.EmailAddress;
Console.WriteLine("Current user's email address: " + emailAddress);

This will output the email address of the current user in the Windows domain.

Get current user in ASP.NET Core:

You can use the User.Identity.Name property to get the current user in ASP.NET Core. Here is an example:

string userName = User.Identity.Name;
ViewBag.UserName = userName;

This will set the ViewBag.UserName property to the current user's name.

Get the SID of the current Windows account in C#:

You can use the WindowsIdentity class to get the SID of the current Windows account. Here is an example:

WindowsIdentity windowsIdentity = WindowsIdentity.GetCurrent();
string userSid = windowsIdentity.User.Value;
Console.WriteLine("Current user SID: " + userSid);

This will output the SID of the current Windows account.

Get Current User in C# Application:

Use Environment.UserName to retrieve the current user's name.

using System;

class Program {
    static void Main() {
        string currentUser = Environment.UserName;
        Console.WriteLine($"Current User: {currentUser}");
    }
}

C# Get Current Windows Username:

Retrieve the current Windows username using Environment.UserName.

using System;

class Program {
    static void Main() {
        string windowsUsername = Environment.UserName;
        Console.WriteLine($"Windows Username: {windowsUsername}");
    }
}

Environment.UserName in C#:

Access the current user's name using Environment.UserName.

using System;

class Program {
    static void Main() {
        string currentUser = Environment.UserName;
        Console.WriteLine($"Current User: {currentUser}");
    }
}

WindowsIdentity.GetCurrent C# Example:

Use WindowsIdentity.GetCurrent to retrieve information about the current Windows user.

using System;
using System.Security.Principal;

class Program {
    static void Main() {
        WindowsIdentity currentIdentity = WindowsIdentity.GetCurrent();
        Console.WriteLine($"Current User: {currentIdentity.Name}");
    }
}

C# Get Current User Domain and Username:

Use Environment.UserDomainName and Environment.UserName to get the current user's domain and username.

using System;

class Program {
    static void Main() {
        string userDomain = Environment.UserDomainName;
        string userName = Environment.UserName;
        Console.WriteLine($"User: {userDomain}\\{userName}");
    }
}

WindowsPrincipal.GetCurrent in C#:

Use WindowsPrincipal.GetCurrent to access the current Windows user's principal.

using System;
using System.Security.Principal;

class Program {
    static void Main() {
        WindowsPrincipal currentPrincipal = WindowsPrincipal.GetCurrent();
        Console.WriteLine($"Current User: {currentPrincipal.Identity.Name}");
    }
}

GetCurrentUser Function in C#:

Implement a custom function to get the current user.

using System;

class Program {
    static void Main() {
        string currentUser = GetCurrentUser();
        Console.WriteLine($"Current User: {currentUser}");
    }

    static string GetCurrentUser() {
        return Environment.UserName;
    }
}

C# Get Current User SID:

Use WindowsIdentity.GetCurrent().User.Value to get the current user's SID.

using System;
using System.Security.Principal;

class Program {
    static void Main() {
        SecurityIdentifier currentUserSID = WindowsIdentity.GetCurrent().User;
        Console.WriteLine($"Current User SID: {currentUserSID.Value}");
    }
}

Getting the Current User in WPF C#:

Retrieve the current user in a WPF application.

using System;
using System.Windows;

class MainWindow : Window {
    public MainWindow() {
        string currentUser = Environment.UserName;
        MessageBox.Show($"Current User: {currentUser}");
    }
}

GetCurrentUser() Method in C# Windows Forms:

Get the current user in a Windows Forms application.

using System;
using System.Windows.Forms;

class MainForm : Form {
    public MainForm() {
        string currentUser = GetCurrentUser();
        MessageBox.Show($"Current User: {currentUser}");
    }

    string GetCurrentUser() {
        return Environment.UserName;
    }
}