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DatabaseAccess (Class Code in C#, C Sharp)

 using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Data.SqlClient; using System.Data; namespace EXAMPLE SYSTEM NAME  {         public class DatabaseAccess     {         public static SqlConnection conn;         private static SqlConnection ConnOpen()         {             if(conn == null)             {                 conn = new SqlConnection(CONNECTION STRING);             }             if(conn.State!=System.Data.ConnectionState.Open)             {                 conn.Open();             }             return conn; ...