Question

 public class Account
        {
            public string Username
            {
                get { return Username; }
                set { Username = value; }
            }
        }


public class ListAcc
        {
            static void Data()
            {
                List<Account> UserList = new List<Account>();
                //example of adding user account
                Account acc = new Account();
                acc.Username = textBox1.Text; //error
                UserList.Add(acc);
            }
        }

there are a error from access to textBox1.Text? ( An object reference is required for the nonstatic field, method, or property)… Someone can help?

but if the code is:

    private void textBox1_TextChanged(object sender, EventArgs e)
    {
            List<Account> UserList = new List<Account>();
            //example of adding user account
            Account acc = new Account();
            acc.Username = textBox1.Text;
            UserList.Add(acc);
    }

it’s work! someone can help me fix my error? Many thanks!

Answer 1

TextBox1 is a member variable which cannot be accessed in a static method.
You can have your code as below.

public class ListAcc 
{
            private static List<Account> UserList;
            public static List<Account> Data() 
            { 
                 return UserList;
            } 
        }
private void textBox1_TextChanged(object sender, EventArgs e) 
    { 
            UserList = new List<Account>(); 
            //example of adding user account 
            Account acc = new Account(); 
            acc.Username = textBox1.Text; 
            UserList.Add(acc); 
    }