Drag and drop to datagridview in vb.net

I am using two Datagridview

in my code, I am dragging content from Me.datagridview2

and dragging it to Me.datagridview1

. This process is successful. But as soon as I click on a cell other than the deleted content cell, the dropped content disappears. Here's my code

 Private Sub DataGridView2_MouseDown(sender As Object, e As System.Windows.Forms.MouseEventArgs) Handles DataGridView2.MouseDown
    Try
        If Me.DataGridView2.SelectedRows.Count = 0 Then
            Exit Sub
        End If
        Me.DataGridView2.DoDragDrop(Me.DataGridView2.SelectedRows(0), DragDropEffects.All)
    Catch ex As Exception
        MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try
End Sub

Private Sub DataGridView1_DragDrop(sender As Object, e As System.Windows.Forms.DragEventArgs) Handles DataGridView1.DragDrop
  Try
        Dim r As DataGridViewRow = e.Data.GetData(GetType(DataGridViewRow))
        If Me.DataGridView1.SelectedRows.Count = 0 Then
            Exit Sub
        End If

        Dim i As Integer = Me.DataGridView1.SelectedRows(0).Index
        Me.DataGridView1.Rows(i).Cells(1).Value = r.Cells(0).Value
        Me.DataGridView1.Rows(i).Cells(2).Value = r.Cells(1).Value
        Me.DataGridView1.Rows(i).Cells(3).Value = r.Cells(2).Value
        Me.DataGridView1.Rows(i).Cells(4).Value = r.Cells(3).Value

    Catch ex As Exception
        MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try
End Sub

Private Sub DataGridView1_DragEnter(sender As Object, e As System.Windows.Forms.DragEventArgs) Handles DataGridView1.DragEnter
    Try
        e.Effect = DragDropEffects.Copy
    Catch ex As Exception
        MessageBox.Show(ex.Message, "Message", MessageBoxButtons.OK, MessageBoxIcon.Error)
    End Try
End Sub

      

        
        
        
      

    

You have the following doubts
1. Why does the disappearing content disappear?
2.whenever we start editing the datagridview, the row is automatically added below. Why isn't it being added when I delete content in the datagridview.?

Please help me.