[ASP.net初学者]数据库连接

//Test.aspx.cs页面内容如下,引用项添加System.Configuration的引用。
usingSystem;
usingSystem.Collections.Generic;
usingSystem.Linq;usingSystem.Web;
usingSystem.Web.UI;
usingSystem.Web.UI.WebControls;
usingSystem.Configuration;
usingSystem.Data;
usingSystem.Data.SqlClient;
namespaceConnTest{
publicpartialclassTest:System.Web.UI.Page{
protectedvoidPage_Load(objectsender,EventArgse)
{
if(IsPostBack==false)
{
update();
}
}

publicvoidupdate()
{stringcustomer="select*fromNames";
SqlConnectioncon=newSqlConnection(System.Configuration.ConfigurationManager.AppSettings["connstr"]);
con.Open();
DataSetds=newDataSet();
SqlDataAdapterda=newSqlDataAdapter(customer,con);
da.Fill(ds,"Customer");
if(ds!=null)
{gv1.DataSource=ds.Tables[0];
gv1.DataMember="Customer";
gv1.DataBind();ds.Clear();
con.Close();
}
}
}
}

//Test.aspx页面中添加GridView控件，ID为gv1
//web.config页面中添加代码如下：
<appSettings>
<addkey="connstr"value="server=.;InitialCatalog=Test;uid=sa;pwd=sa123456;MaxPoolSize=512;ConnectTimeout=600"></add>
</appSettings>