use datareader for binding dataGridView1

you assign the datareader object the same way, why do you ask?
any issue? error messages?

most important point for your feedback: please keep your test/code as simple as possible as to reproduce the problem.

sample code is given below..
using (SqlCommand command = new SqlCommand("select * from YourTable", new SqlConnection("Server=.;Trusted_Connection=False;User ID=xxx;Password=xxxx;Initial Catalog=DatabaseName")))
            {
                try
                {
                    command.Connection.Open();
                    SqlDataReader reader = command.ExecuteReader();
                    GridView1.DataSource = reader;
                    GridView1.DataBind();
                }
                catch (Exception ex)
                {
                    command.Connection.Close();
                }
                finally
                {
                    command.Connection.Close();
                }
            }

SqlConnection cnsql = new SqlConnection(cnstring);
            cnsql.Open();
            string sql = "select * from sell";
            SqlCommand cmsql = new SqlCommand(sql, cnsql);
            SqlDataReader drsql = cmsql.ExecuteReader();

            dataGridView1.DataSource = drsql;

this is my code
but it's not work

and what it's your exact error message?

not get any error but it not show any data or any thing

thanks