大家好，我收到以下错误：“当前上下文中不存在名称‘ConfigurationManager’”
// namespaces
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data.SqlClient;
using System.Configuration;
using System.IO;
namespace Database1
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
public static string GetConnectionString(string strConnection)
{
//variable to hold our connection string for returning it
string strReturn = "";
//check to see if the user provided a connection string name
//this is for if your application has more than one connection string
if (!string.IsNullOrEmpty(strConnection)) //a connection string name was
{
//get the connection string by the name provided
strReturn = ConfigurationManager.ConnectionStrings[strConnection].ConnectionString;
}
else //no connection string name was provided
{
//get the default connection string
strReturn = ConfigurationManager.ConnectionStrings["YourConnectionName"].ConnectionString;
}
//return the connection string to the calling method
return strReturn;
}
}
}