How to display result in GridView? - vb.net

Question

NET WinForms.
VB code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label1.Text = "Beginning"
Dim a As Integer = 20
Dim b As Integer = 3
Do Until b > a
a & " " & b
a = a - 2
b = b + 1
Loop
Label2.Text = "End"
End Sub
I want to display the result of this row a & " " & b in GridView.
How should I change the code to make this work properly?

Answer 1

I would recommend you store the value into DataTable and bind into the DataGridView
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label1.Text = "Beginning"
'Create a new datatable here
Dim dt As New DataTable
dt.Columns.Add("Result")
Dim a As Integer = 20
Dim b As Integer = 3
Do Until b > a
'Create DataRow here and put the value into DataRow
Dim dr As DataRow = dt.NewRow
dr("result") = a.ToString & " " & b.ToString
'a & " " & b
dt.Rows.Add(dr)
a = a - 2
b = b + 1
Loop
'Bind your dt into the GridView
DataGridView.DataSource = dt
Label2.Text = "End"
End Sub

Answer 2

Add DataGridView to your form, and add 2 columns, then next updated code will do that
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Label1.Text = "Beginning"
' If the DataGridView is not bound to any data source, this code will clear content
DataGridView1.Rows.Clear()
Dim a As Integer = 20
Dim b As Integer = 3
Do Until b > a
'a & " " & b
' add the row to the end of the grid with the Add() method of the Rows collection...
DataGridView1.Rows.Add(New String(){a.ToString(), b.ToString()})
a = a - 2
b = b + 1
Loop
Label2.Text = "End"
End Sub