private bool CheckUsername()
{
var conn = SQLHelpers.GetConnection();
conn.Open();
var command = new SqlCommand("SELECT * FROM Bruger WHERE Brugernavn=@brugernavn",
conn);
command.Parameters.AddWithValue("@brugernavn", UserNameTextBox.Text);
using (var reader = command.ExecuteReader())
{
if (reader.Read())
{
conn.Close();
return(false);
}
}
return(true);
}