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1. ODBC DSN -- INFORMIX 3.30 ODBC Driver
2. ODBC without DSN -- INFORMIX 3.30 ODBC Driver
3. ODBC Informix-CLI 2.5 ODBC Driver
4. OleDb -- IBM Informix OleDb Provider

// ODBC DSN -- INFORMIX 3.30 ODBC Driver     
    
  using System.Data.Odbc;   
    
  OdbcConnection conn = new OdbcConnection();   
  conn.ConnectionString =    
                "Dsn=DsnName;" +    
                "Host=HostName;" +    
                "Server=ServerName;" +    
                "Service=ServerName;" +    
                "Protocol=olsoctcp;" +    
                "Database=DataBaseName;" +    
                "Uid=UserName;" +    
                "Pwd=Secret;";    
  conn.Open();   
     

// ODBC without DSN -- INFORMIX 3.30 ODBC Driver     
    
  using System.Data.Odbc;   
    
  OdbcConnection conn = new OdbcConnection();   
  conn.ConnectionString =    
                "Dsn="";" +    
                "Driver={INFORMIX 3.30 32 BIT};" +    
                "Host=HostName;" +    
                "Server=ServerName;" +    
                "Service=ServerName;" +    
                "Protocol=olsoctcp;" +    
                "Database=DataBaseName;" +    
                "Uid=UserName;" +    
                "Pwd=Secret;";    
  conn.Open();   

// ODBC Informix-CLI 2.5 ODBC Driver     
    
  using System.Data.Odbc;   
    
  OdbcConnection conn = new OdbcConnection();   
  conn.ConnectionString =    
            "Driver={Informix-CLI 2.5 (32 Bit)};" +    
            "Server=ServerName;" +    
            "DataBase=DataBaseName;" +    
            "Uid=UserName;" +    
            "Pwd=Secret;";    
  conn.Open();   

// OleDb -- IBM Informix OleDb Provider     
    
  using System.Data.OleDb;   
    
  OleDbConnection conn = new OleDbConnection();   
  conn.ConnectionString =    
          "Driver=IFXOLEDBC;" +    
          "Data Source=DataBaseName@ServerName;" +    
          "User id=UserName;" +    
          "Password=Secret;";    
          "Persist Security Info=true;";    
  conn.Open();   

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