.net c# SQL通用数据库类

using System.Collections;namespace Forums.cs{ /// <summary> /// SQLBASE1 的摘要说明。 /// </summary> public class SQLBASE {     public static readonly  string sqlConnection = System.Configuration.ConfigurationSettings.AppSettings["DNS1"].ToString();  public static  SqlConnection conn=new SqlConnection(sqlConnection);  public SQLBASE()  {   //   // TODO: 在此处添加构造函数逻辑   //  }