public bool Check(string username, string password)
{
var user = _fileStore.GetUsers()
.Where(x => x.Username == username && x.Password == password)
.FirstOrDefault();
return(user != null);
}
private void button3_Click(object sender, EventArgs e)
{
var _users = _fileUserStore.GetUsers();
int i = 1;
string allUsers = "";
foreach (var item in _users)
{
allUsers += (i.ToString() + ". " + item.Name.ToString() + " " +
item.Username.ToString() + " " + item.Password.ToString() + "\n");
i++;
}
MessageBox.Show(allUsers, "User's list");
this.Close();
}