问调用SQL的Web服务不能在Visual Studio之外工作

EN

[WebMethod]
public string CC()
{
    DataSet s = null;
    String c;
    System.Configuration.Configuration rootWebConfig =
            System.Web.Configuration.WebConfigurationManager.OpenWebConfiguration("\\");

    System.Data.SqlClient.SqlConnection sqlConnection1 = new System.Data.SqlClient.SqlConnection();

    sqlConnection1.ConnectionString = connString.ConnectionString;
        string select = "SELECT count (*) from [Customers]";

    // Create an Adapter
    SqlDataAdapter da = new SqlDataAdapter(select, sqlConnection1);

    // Create a New DataSet
    DataSet ds = new DataSet();

    da.Fill(ds, "Customers");

    return ds.Tables[0].Rows[0][0].ToString();
}

<?xml version="1.0"?>
<configuration>
    <appSettings/>
    <connectionStrings>
        <add name="ExecuTechConnectionString" 
             connectionString="user id=yuuvuv1; password=user;server=202.155.146.289\SQLEXPRESS;Trusted_Connection=no;database=YuYu; connection timeout=30"
             providerName="System.Data.SqlClient" />
    </connectionStrings>
    <system.web>
        <compilation debug="true" />
        <authentication mode="Windows" />
    </system.web>
</configuration>'