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string con, sql;
con = "Server=.;initial catalog=LIAN;user id=sa;pwd=123321";
sql = "select * from Lian";
SqlConnection mycon = new SqlConnection(con);
mycon.Open();
SqlDataAdapter myda = new SqlDataAdapter(sql, con);
DataSet myds = new DataSet();
myda.Fill(myds);
dataGridView1.DataSource = myds.Tables[0];
mycon.Close();
Server=.;Database=LIAN;user id=sa;password=123321;persist security info=false;packet size=4096