总是提示ConnectionString 属性尚未初始化。怎么解决呀

Question

            string name = TextBox1.Text;
            string pwd = TextBox2.Text;
            string sqlstr = "select * from user where name='" + name + "' and pwd='" + pwd + "'";
            if (DbHelperSQL.Exists(sqlstr))
            {            }
            else
            {
                Label1.Text = "不存在";
            }
            总是提示ConnectionString 属性尚未初始化。怎么解决呀
           web.config配置文件里是这样写的
<add name="abc" connectionString="Data Source=.\sqlexpress; AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=true;User Instance=True"/>

Answer 1

configurationManager.connectionString["abc"].ToString()

Answer 2

LZ没帖全得到ConnectionString的地方帖出来看看

Answer 3

  configurationManager.connectionString["abc"].ToString()

Answer 4

你的连接字符是这这个结中？？
<configuration>
  <connectionStrings>

Answer 5

 <connectionStrings>
    <add name="abc" connectionString="Data Source=.\sqlexpress; AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=true;User Instance=True"/>
  </connectionStrings>

Answer 6

<add name="BusinessDb" connectionString="Data source=.;Initial Catalog=JZFW_2009;uid=sa;pwd=lee;" providerName="System.Data.SqlClient"/>m_strConn=ConfigurationSettings.AppSettings["BusinessDb"].ToString();

Answer 7

web.config里面设置了，方法里面调用了吗？