这样试一下：string constr="server=.;database=text;uid=sa;password=";
SqlConnection con = new SqlConnection(constr);
string cmdStr = "select daty,waterhigh,waterflow from zong_gk ";
SqlDataAdapter da = new SqlDataAdapter(cmdStr, con);//自动打开连接
DataTable dt = new DataTable();
da.Fill(dt);...
