C# ErrorSystem.Data.OleDb.OLEDBEException（0x80004005）：ORA-12504:TNS:未在CONNECT_数据中为侦听器提供服务_名称

我正在从事一个c#项目，在visual studio中注册一个新用户，并使用toad作为数据库。连接到数据库的代码是：

protected void New_User(object sender, EventArgs e)
    {
    OleDbConnection conn;


     OleDbDataAdapter OledbAdapter = new OleDbDataAdapter();
            String sql = "";
            conn = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings["ConnString"].ConnectionString);

            sql = "INSERT INTO USER_DETAIL VALUES('" + TextBoxUN.Text + "','" +TextBoxPass.Text+ "', '" + TextBoxEmail.Text + "','" + TextBoxmobileno.Text +"')";
            try
            {
                conn.Open();
                OledbAdapter.InsertCommand = new OleDbCommand(sql, conn);
                OledbAdapter.InsertCommand.ExecuteNonQuery();
                Label_success.Text = "Successfully inserted into database";
            }
            catch (Exception ex)
            {
                Label_success.Text = "Error" + ex.ToString();
            }
            finally
            {
                conn.Close();
            }
}

我的web.config文件是：

 <?xml version="1.0"?>

    <!--
      For more information on how to configure your ASP.NET application, please visit
      http://go.microsoft.com/fwlink/?LinkId=169433
      -->

    <configuration>
      <connectionStrings>
        <add name="ConnString" connectionString="Provider=MSDAORA;Data Source=TRGDB;Persist Security Info=True;Password=pass;User ID=TRAINEE01" providerName="System.Data.OleDb"/>
        <add name="ApplicationServices"
             connectionString="data source=.\SQLEXPRESS;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnetdb.mdf;User Instance=true"
             providerName="System.Data.SqlClient" />
      </connectionStrings>

      <system.web>
        <compilation debug="true" targetFramework="4.0" />

        <authentication mode="Forms">
          <forms loginUrl="~/Account/Login.aspx" timeout="2880" />
        </authentication>

        <membership>
          <providers>
            <clear/>
            <add name="AspNetSqlMembershipProvider" type="System.Web.Security.SqlMembershipProvider" connectionStringName="ApplicationServices"
                 enablePasswordRetrieval="false" enablePasswordReset="true" requiresQuestionAndAnswer="false" requiresUniqueEmail="false"
                 maxInvalidPasswordAttempts="5" minRequiredPasswordLength="6" minRequiredNonalphanumericCharacters="0" passwordAttemptWindow="10"
                 applicationName="/" />
          </providers>
        </membership>

        <profile>
          <providers>
            <clear/>
            <add name="AspNetSqlProfileProvider" type="System.Web.Profile.SqlProfileProvider" connectionStringName="ApplicationServices" applicationName="/"/>
          </providers>
        </profile>

        <roleManager enabled="false">
          <providers>
            <clear/>
            <add name="AspNetSqlRoleProvider" type="System.Web.Security.SqlRoleProvider" connectionStringName="ApplicationServices" applicationName="/" />
            <add name="AspNetWindowsTokenRoleProvider" type="System.Web.Security.WindowsTokenRoleProvider" applicationName="/" />
          </providers>
        </roleManager>

      </system.web>

      <system.webServer>
         <modules runAllManagedModulesForAllRequests="true"/>
      </system.webServer>
    </configuration>

但我得到了以下错误：

ErrorSystem.Data.OleDb.OLEDBEException（0x80004005）：ORA-12504:TNS:侦听器在System.Data.OleDb.OleDbConnectionInternal..ctor（OleDbConnectionString constr，OLEDBConnectionConnection connection）的System.Data.OleDb.OleDbConnectionFactory.CreateConnection中的CONNECTOR（OleDbConnectionString construct，OLEDBConnectionConnection connection）中未被赋予服务名称（数据库连接选项、对象池组ProviderInfo、数据库连接池池、数据库连接所有者对象）位于System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection（数据库连接所有者连接、数据库连接池组池组）位于System.Data.ProviderBase.DbConnectionFactory.GetConnection（数据库连接所有者连接）项目中System.Data.OleDb.OleDbConnection.Open（）的System.Data.ProviderBase.DbConnectionClosed.OpenConnection（DbConnection outerConnection，DbConnectionFactory connectionFactory）的默认值。新用户（对象发送方，事件参数e）在c:\documents and settings\admin\my documents\visual studio 2010\Project\Project\Default.aspx.cs中：第26行

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您的连接字符串应如下所示：

数据源=（DESCRIPTION=（ADDRESS=（PROTOCOL=TCP）（HOST=MyHost）（PORT=MyPort））（CONNECT_Data=（SERVICE_NAME=MyOracleSID））； 用户Id=我的用户名；密码=我的密码

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请参阅：

不要使用字符串连接向SQL语句中添加值：改为ParameterSie。一旦连接到数据库，您将容易受到SQL注入的攻击。