弄了一晚上研究连接字符串，给自己留个清楚的回忆~！

数据库连接字符串：

    <connectionStrings>
  <add name="AdventureWorksDWConnectionString" connectionString="Data Source=QQ123\SQL2005;Initial Catalog=AdventureWorksDW;Persist Security Info=True;User ID=sa;Password=7894561230."
   providerName="System.Data.SqlClient" />
 </connectionStrings>

在C#语句的连接方式语句：

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string con = ConfigurationManager.ConnectionStrings["AdventureWorksDWConnectionString"].ConnectionString;
            Label2.Text = con;

            SqlConnection conn = new SqlConnection(con);

            SqlDataAdapter asd = new SqlDataAdapter();
            asd.SelectCommand = new SqlCommand("select * from DatabaseLog", conn);
            DataSet ds = new DataSet();
            asd.Fill(ds, "emp");


            this.GridView1.DataSource = ds.Tables["emp"];
            this.GridView1.DataBind();
         

        }
}