using System;
using System.Data;
using System.Data.SqlClient;

   class SqlExceptionDemo {
      static void Main(){
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         SqlConnection conn = new SqlConnection(connString);

         SqlCommand cmd = conn.CreateCommand();
      
         cmd.CommandType = CommandType.StoredProcedure; 
         cmd.CommandText = "something wrong here";

         try {
            conn.Open();
 
            SqlDataReader dr = cmd.ExecuteReader();

            string str = dr.GetValue(20).ToString();

            dr.Close();
         }
         catch (System.InvalidOperationException ex)
         {
            string str;
            str = "Source:" + ex.Source;
            str += "
" + "Message:"+ ex.Message;
            str += "
" + "
";
            str += "
" + "Stack Trace :" + ex.StackTrace;
            Console.WriteLine (str, "Specific Exception");
         }
         catch (System.Data.SqlClient.SqlException ex)
         {
            string str;
            str = "Source:" + ex.Source;
            str += "
" + "Message:" + ex.Message;
            Console.WriteLine (str, "Database Exception");
         }
         catch (System.Exception ex)
         {
            string str;
            str = "Source:" + ex.Source;
            str += "
"+ "Message:" + ex.Message;
            Console.WriteLine (str, "Generic Exception");
         }
         finally
         {
            if ( conn.State == ConnectionState.Open)
            {
               Console.WriteLine ("Finally block closing the connection", "Finally");
               conn.Close();
            }
         }
      }
   }


           
          

   



using System;
using System.Data;
using System.Data.SqlClient;

   class SqlExceptionDemo {
      static void Main(){
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         SqlConnection conn = new SqlConnection(connString);
         SqlCommand cmd = conn.CreateCommand(); 
  
         cmd.CommandType = CommandType.StoredProcedure;
  
         cmd.CommandText = "wrong sql";

         try{  
            conn.Open();
            SqlDataReader dr = cmd.ExecuteReader();    
            dr.Close();      
         } catch (System.Data.SqlClient.SqlException ex) {
            string str;
            str = "Source:" + ex.Source;
            str += "
" + "Exception Message:" + ex.Message;
            Console.WriteLine(str);
         }
         catch (System.Exception ex) 
         {
            string str;
            str = "Source:" + ex.Source;
            str += "
" + "Exception Message:" + ex.Message;
            Console.WriteLine(str);
         }
         finally
         {
            if (conn.State == ConnectionState.Open)
            {
               Console.WriteLine("Finally block closing the connection", "Finally");
               conn.Close();
            }   
         } 
      }
   }
           
          

   
 


using System;
using System.Data;
using System.Data.Sql;

class MainClass {
    public static void Main(string[] args) {
        using (DataTable SqlSources = SqlDataSourceEnumerator.Instance.GetDataSources()) {
            Console.WriteLine("Discover SQL Server Instances:");
            foreach (DataRow source in SqlSources.Rows) {
                Console.WriteLine(" Server Name:{0}", source["ServerName"]);
                Console.WriteLine("   Instance Name:{0}", source["InstanceName"]);
                Console.WriteLine("   Is Clustered:{0}", source["IsClustered"]);
                Console.WriteLine("   Version:{0}", source["Version"]);
            }
        }
    }

}

    

   


using System;
using System.Data; 
using System.Data.SqlClient; 

   class OrdinalIndexer
   {
      static void Main(string[] args)
      {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";
         string sql = @"select FirstName, LastName from Employee";

         SqlConnection conn = new SqlConnection(connString);

         try
         {
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlDataReader reader = cmd.ExecuteReader();
            Console.WriteLine("	{0}   {1}", "First Name".PadRight(25),"Last Name".PadRight(20));
            Console.WriteLine("	{0}   {1}",  "============".PadRight(25), "============".PadRight(20));
            while(reader.Read()) {
               Console.WriteLine(" {0} | {1}", 
                  reader[0].ToString().PadLeft(25),
                  reader[1].ToString().PadLeft(20));
            }
            reader.Close();
         } catch(Exception e) {
            Console.WriteLine("Error Occurred: " + e);
         } finally {
            conn.Close();
         }
      }
   }


           
          

   


using System;
using System.Data;
using System.Data.SqlClient;

   class MultipleResults {
      static void Main(string[] args) {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         string sql1 = @"select FirstName from Employee;";

         string sql2 = @"select FirstName, LastName from Employee;";

         string sql = sql1 + sql2;

         SqlConnection conn = new SqlConnection(connString);

         try
         {
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);

            SqlDataReader reader = cmd.ExecuteReader();

            do{
                while(reader.Read()) {
                   Console.WriteLine("{0} : {1}", reader[0], reader[0]);
                }
                Console.WriteLine("".PadLeft(60, '='));
            } while(reader.NextResult());
            reader.Close();
         } catch(Exception e) {
            Console.WriteLine("Error Occurred: " + e);
         } finally {
            conn.Close();
         }
      }  
   }

           
          

   

using System;
using System.Data; 
using System.Data.SqlClient; 

   class DataLooper{
      static void Main(string[] args) {
         string connString = "server=(local)SQLEXPRESS;database=MyDatabase;Integrated Security=SSPI";

         string sql = @"select FirstName from Employee";

         SqlConnection conn = new SqlConnection(connString);

         try {
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);
            SqlDataReader reader = cmd.ExecuteReader();
            while(reader.Read()) {
               Console.WriteLine("{0}", reader[0]);
            }
            reader.Close();
         }
         catch(Exception e)
         {
            Console.WriteLine("Error Occurred: " + e);
         }
         finally
         {
            conn.Close();
         }
      }
   } 


           
          

   


/*
 * C# Programmers Pocket Consultant
 * Author: Gregory S. MacBeth
 * Email: gmacbeth@comporium.net
 * Create Date: June 27, 2003
 * Last Modified Date:
 * Version: 1
 */
using System;
using System.Data;
using System.Data.SqlClient;

namespace Client.Chapter_13___ADO.NET
{
    public class UsingADataReader
    {
        static void Main(string[] args)
        {
            SqlConnection MyConnection = new SqlConnection(@"Data Source=(local); Initial Catalog = CaseManager; Integrated Security=true");

            MyConnection.Open();

            SqlCommand MyCommand = new SqlCommand("SELECT * FROM CaseInfo", MyConnection);
            SqlDataReader MyDataReader = MyCommand.ExecuteReader(CommandBehavior.CloseConnection);

            while (MyDataReader.Read())
            {
                Console.WriteLine(MyDataReader[0] + " " + MyDataReader[1]);
            }

            MyConnection.Close();
        }
    }
}