Login Control

I've been using this code for login for the last 3years and have no idea where I found it but found a similar tutorial that shows most if not all of it:

 private bool SiteLevelCustomAuthenticationMethod(string UserName, string Password)

        {

            bool boolReturnValue = false;

            string connStr = ConfigurationManager.ConnectionStrings["standdsConnectionString"].ConnectionString;

            SqlConnection Con = new SqlConnection(connStr);

            String strSQL = "Select * from tblUserAccounts";

            SqlCommand command = new SqlCommand(strSQL, Con);

            SqlDataReader Dr;

            Con.Open();

            Dr = command.ExecuteReader();

            while (Dr.Read())

            {

                if ((UserName == Dr["strUserName"].ToString()) & (Password == Dr["strPassword"].ToString()))

                {

                    TypeID = Convert.ToInt32(Dr["strTypeID"].ToString());

                    boolReturnValue = true;

                }

            }

            Dr.Close();

            return boolReturnValue;

        }

Here the link to one with more details:

http://www.c-sharpcorner.com/uploadfile/anjudidi/how-to-use-login-control-in-visual-studio-2008/

I know that at some point I will need to use the 2013 control along with the OWIN login option and hopefully I can figure out how to apply that to our present database by then