Code:
MySqlConnection cs = new MySqlConnection(connectionSQL);
cs.Open();
DataSet ds = new DataSet();
MySqlDataAdapter da = new MySqlDataAdapter("Select * from Transactions WHERE date BETWEEN '"+datePicker1.Text +"' AND '"+datePicker2.Text +"' ", cs);
MySqlCommandBuilder cmd = new MySqlCommandBuilder(da);
da.Fill(ds);
this.dataGrid1.ItemsSource = ds.Tables[0].DefaultView;