sql链接（c#）

SqlConnection con;
        SqlDataAdapter adaptcommand;
        string strconnect;
        string strcommand;
        DataSet dataset1=new DataSet();
        strconnect="Data Source=.\\sqlexpress;Initial Catalog=db_test;Integrated Security=True;Pooling=False";
        strcommand="select * from dt_test";
       
        adaptcommand=new SqlDataAdapter(strcommand,strconnect);

        adaptcommand.Fill(dataset1,"data");
        GridView3.DataSource = dataset1.Tables["data"];
        GridView3.DataBind();