ถ้าจะเปลี่ยนสี Chart VB.Net โดยให้มันสลับสีกันจะต้องเพิ่ม Code ตรงไหนหรอค่ะ

 sql = strSql
        myCon = New MySqlConnection
        myCon.ConnectionString = strConn
        myCon.Open()
        myDa = New MySqlDataAdapter(strSql, myCon)
        myDs = New DataSet
        myDs.Clear()
        myDa.Fill(myDs, "OPD")
        dgvData.DataSource = myDs.Tables("OPD") 
Dim chart As Boolean = True
            Dim ChartArea1 As ChartArea = New ChartArea()
            Dim Legend1 As Legend = New Legend()
            Dim Series1 As Series = New Series()
            Dim Chart1 = New Chart()
            Me.Controls.Add(Chart1)
            ChartArea1.Name = "ChartArea1"
            Chart1.ChartAreas.Add(ChartArea1)
            Legend1.Name = "Legend1"
            Chart1.Legends.Add(Legend1)
            Chart1.Location = New System.Drawing.Point(280, 119)
            Chart1.Name = "Chart1"
            Series1.ChartArea = "ChartArea1"
            Series1.Legend = "Legend1"
            Series1.Name = "จำนวน"
            Chart1.Series.Add(Series1)
            Chart1.Size = New System.Drawing.Size(595, 220)
            Chart1.TabIndex = 0
            Chart1.Text = "Chart1"
Chart1.Series("จำนวน").XValueMember = "icd10" 'รหัสโรค
                Chart1.Series("จำนวน").YValueMembers = "cicd10" 'จำนวน
Chart1.DataSource = myDs.Tables("OPD")