网站在服务器上运行，出现了“超时时间已到，但尚未从池中获取连接，出现这种情况可能是因为所有池均在使用，并且达到了最大池大小。，怎么解决啊。
namespace Management.DAL
{
    public static class DBHelper
    {

        private static SqlConnection connection;
        public static SqlConnection Connection
        {
            get
            {
                string connectionString = "Data Source=.;Initial Catalog=kq;Integrated Security=True"; //ConfigurationManager.ConnectionStrings["MyOfficeConnectionString"].ConnectionString;
                connection = new SqlConnection(connectionString);
                if (connection == null)
                {                    
                    connection.Open();
                }
                else if (connection.State == System.Data.ConnectionState.Closed)
                {
                    connection.Open();
                }
                else if (connection.State == System.Data.ConnectionState.Broken)
                {
                    connection.Close();
                    connection.Open();
                }
                return connection;
            }
        }

应该怎么修改啊。

<configuration>
    <appSettings/>
    <connectionStrings>
  <add name="kqConnectionString1" connectionString="Data Source=.;Initial Catalog=kq;Integrated Security=True;MultipleActiveResultSets=False;Packet Size=4096;Application Name=&quot;Microsoft SQL Server Management Studio&quot;"
   providerName="System.Data.SqlClient" />
 </connectionStrings>
    <system.web>

web.config文件怎么修改啊，