Return a value from sql

Question

Im trying move my sql connection to a method in a class file and return a value to check if the username existing in the db and display as text in the page to show others that t

Answer 1

public static bool searchusername(string username)
{
    connectionString = ConfigurationManager.ConnectionStrings["myConnectionString"].ConnectionString;
    using(SqlConnection conn = new SqlConnection(connectionString))
    {
        conn.Open();

        bool exists = false;

        using (SqlCommand comm = new SqlCommand("select count(*) from Member where UserName = @UserName", conn))
        {
            comm.Parameters.AddWithValue("@username", username);
            exists = (int)comm.ExecuteScalar() > 0;
        }
        return exists;
    }

In your page

if(MemberDB.searchusername(UNameTxtBox.Text))
{
    ExistLabel.Text = "UserName exists";
}