Я хочу объединить все таблицы данных в один datagridview

Hello Guys,! i have created 4 data tables in my project and now i want to merge this all data tables in a single datagridview

DataSet dsa = new DataSet();
            DataTable dt1 = new DataTable();
            dsa.Tables.Add(dt1);
            OleDbDataAdapter da = new OleDbDataAdapter();
            da = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Small] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Small.......')Group By [Flavours]", VCON);
            da.Fill(dt1);
            dataGridView1.DataSource = dt1;
            VCON.Close();
            DataSet dsa1 = new DataSet();
            DataTable dt2 = new DataTable();
            dsa1.Tables.Add(dt2);
            OleDbDataAdapter da1 = new OleDbDataAdapter();
            da1 = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Medium] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Medium......')Group By [Flavours]", VCON);
            da1.Fill(dt2);
            dataGridView1.DataSource = dt2;
            VCON.Close();
            DataSet dsa2 = new DataSet();
            DataTable dt3 = new DataTable();
            dsa.Tables.Add(dt3);
            OleDbDataAdapter da2 = new OleDbDataAdapter();
            da2 = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Large] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Large.......')Group By [Flavours]", VCON);
            da2.Fill(dt3);
            dataGridView1.DataSource = dt3;
            VCON.Close();
            DataSet dsa3 = new DataSet();
            DataTable dt4 = new DataTable();
            dsa.Tables.Add(dt1);
            dsa.Tables.Add(dt2);
            dsa.Tables.Add(dt3);
            dsa.Tables.Add(dt4);
            OleDbDataAdapter da3 = new OleDbDataAdapter();
            da3 = new OleDbDataAdapter("SELECT [Flavours] As [Flavours],count(column2) As [Ex Large] from [Total] Where [Date] between #" + dateTimePicker1.Value.ToString("dd/MM/yyyy") + "# AND #" + dateTimePicker2.Value.ToString("dd/MM/yyyy") + "# AND [column2] IN ('Ex  Large...')Group By [Flavours]", VCON);
            da3.Fill(dt4);
            dataGridView1.DataSource = dt4;
            VCON.Close();