Add and remove rows for bar chart created by VBA - vba

Question

I need to create Bar chart in Excel VBA. I used the code below, but when I am ADDING or DELETING A ROW it is not working.
I need that chart on fixed range (K1). Because when I am calculating for the second time it creates another chart.
How can I change the code to prevent a new chart being added when I adjust the data source?
Private Sub CommandButton2_Click()
Sheets("Sheet7").Range("F2:H12").Select
ActiveSheet.Shapes.AddChart.Select
ActiveChart.ChartType = xlBarClustered
ActiveChart.SetSourceData Source:=Range("Sheet7!$F$2:$H$12")
ActiveChart.SeriesCollection(1).Name = "=Sheet7!$G$1"
ActiveChart.SeriesCollection(2).Name = "=Sheet7!$H$1"
End Sub

Answer 1

In the sample code below it checks to see if a chart called TheChart already exists, and if not, creates a new one. You can now add and remove rows and the chart should will update. Additionally, if you add a new row at the bottom and click the button it will redraw TheChart without creating a new one.
The chart is always located at the top-left of K1 per the rngChartTopLeft variable - which you can adjust if required.
The code assumes that it is running in a Sheet module (hence Set ws = Me) and if you were running it in a standard module you can set the sheet with Set ws = ThisWorkbook.Worksheets("your_sheet").
Option Explicit
Private Sub CommandButton1_Click()
Dim ws As Worksheet
Dim chto As ChartObject
Dim rngChartTopLeft As Range
Dim rngData As Range
' assumes the code is in a sheet object
Set ws = Me
' top left of chart
Set rngChartTopLeft = ws.Range("K1")
' create chart or get existing chart
If ws.ChartObjects.Count = 0 Then
Set chto = ws.ChartObjects.Add( _
Left:=rngChartTopLeft.Left, _
Width:=500, _
Top:=rngChartTopLeft.Top, _
Height:=500)
chto.Name = "TheChart"
Else
Set chto = ws.ChartObjects("TheChart")
End If
' set chart type
chto.Chart.ChartType = xlBarClustered
' get data range per last row of data
Set rngData = ws.Range("F2:G" & ws.Cells(ws.Rows.Count, "G").End(xlUp).Row)
' set new chart range
chto.Chart.SetSourceData rngData
End Sub

Answer 2

please check the below code:
Option Explicit
Private Sub CommandButton1_Click()
Dim mychart As Shape
Dim lastrow As Long
lastrow = Sheet7.Cells(Rows.Count, "F").End(xlUp).Row
For Each mychart In ActiveSheet.Shapes
If mychart.Name = "CommandButton1" Then GoTo exit_
mychart.Delete
exit_:
Next
Sheets("Sheet7").Range("F2:H" & lastrow).Select
ActiveSheet.Shapes.AddChart.Select
ActiveChart.ChartType = xlBarClustered
ActiveChart.SetSourceData Source:=Range("Sheet7!$F$2:$H$" & lastrow)
ActiveChart.SeriesCollection(1).Name = "=Sheet7!$G$1"
ActiveChart.SeriesCollection(2).Name = "=Sheet7!$H$1"
End Sub