error CS0103: The name `String' does not exist in the current context

[LegendWill]

I need help solving the error that is in the title.

1. DevLogin.cs(5,35): error CS0103: The name `String’ does not exist in the current context

2. DevLogin.cs(6,35): error CS0103: The name `String’ does not exist in the current context

   using UnityEngine;
   using System.Collections;

   public class Devlogin : MonoBehaviour {
   private string username = String.Empty;
   private string password = String.Empty;
   private bool correctLogin;

   void  Update (){
   	correctLogin = (username == "LegendWill" && password == "admin");
   }
   
   void  OnGUI (){
   	Rect windowRect;
   	windowRect.x = Screen.width / 2 - 100;
   	windowRect.y = Screen.height / 2 - 50;
   	windowRect.width = 200;
   	windowRect.height = 100;
   	GUI.Window(0, windowRect, OnWindowGUI, "Authentication");
   }
   
   void  OnWindowGUI (){
   	username = GUILayout.TextField(username);
   	password = GUILayout.PasswordField(password, '*'[0]);
   	if (GUILayout.Button("Login") && correctLogin)
   	{
   		Debug.Log("You logged in!");
   		enabled = false;
   	}
   }
   

   }

[AyAMrau]

It’s string.Empty with lowercase s

[Landern]

using UnityEngine;
using System.Collections;

public class Devlogin : MonoBehaviour {
    private string username = string.Empty;
    private string password = string.Empty;
    private bool correctLogin;

    void Update (){
        correctLogin = (username == "LegendWill" && password == "admin");
    }

    void  OnGUI (){
        Rect windowRect = new Rect(Screen.width / 2 - 100, Screen.height / 2 - 50, 200, 100); // You need to instantiate the rect object, constructor takes what you were setting property by property.
        GUI.Window(0, windowRect, OnWindowGUI, "Authentication");
    }

    void  OnWindowGUI (int id){
        username = GUILayout.TextField(username);
        password = GUILayout.PasswordField(password, '*');  // I have no idea what you were doing with [0].
        if (GUILayout.Button("Login") && correctLogin)
        {
            Debug.Log("You logged in!");
            enabled = false;
        }
    }
}