未能将我的网页连接到数据库

更新：我错过了我应该使用MySql.Data.MySqlClient引用和MySqlConnection，因为我一直在尝试连接一个mysql服务器。 Java误导我，我可以轻松地连接两条线。抱歉花时间**未能将我的网页连接到数据库

我试图将我的网页连接到数据库。为了生成表格，我可以使用java轻松连接，但无法使用C＃/ Asp连接。

输出屏幕上的错误是：

A first chance exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll

代码：

try { 
    con = new SqlConnection("Data Source = urlhere ;" + 
          "uid = u_yucel;" + 
          "pwd = *****; " + 
          "database = u_yucel; " + 
          "connection timeout = 2"); 
    cmd.CommandText = "select * from person"; 
    con.Open(); 
    cmd.Connection = con; 

    DropDownList1.DataSource = cmd.ExecuteReader(); 
    DropDownList1.DataTextField = "name"; 
    DropDownList1.DataBind(); 
} 
catch (Exception ex) 
{ 
    Response.Write(ex.Message); 
    Console.WriteLine("123"); 
    Response.Write(ex.StackTrace); 
}

错误消息：

A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server) at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning() at System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity) at System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, TimeoutTimer timeout, SqlConnection owningObject) at System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(ServerInfo serverInfo, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, TimeoutTimer timeout) at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, TimeoutTimer timeout, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) at System.Data.SqlClient.SqlConnection.Open() at DataDeneme1.carSelect.rebind() in E:\VisualStudioProjects\DataDeneme1\DataDeneme1\carSelect.aspx.cs:line 38

来源

2011-05-02 tkcn

你可以请发布你正在尝试使用的连接字符串和一些代码可能吗？这非常含糊。谢谢 – Pepe 2011-05-02 19:18:28

对于异常，消息和堆栈跟踪是什么？并且，发布您在该跟踪中引用的任何代码。 – 2011-05-02 19:19:26

而实际的异常细节（至少是消息，也许是堆栈跟踪） – jeroenh 2011-05-02 19:19:44