show-data
string sql = "select * from t_users where name_user_login = '" +
txt_input_name.Text + "' and password_user = '" + txt_pass.Text + "'";
SqlCommand cmd = new SqlCommand(sql, cn);
cn.Open();
SqlDataReader dr = cmd.ExecuteReader();
dr.Read();
if (dr.HasRows)
{Program.user_id = dr[ 0 ].ToString();Program.user_id