Add columns in grid from textbox

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VB

convert

I have a grid and this already have data like this

Column3 Column4
123     345
1345    235

now i want to add two more columns from textbox to grid e.g if i copy this data in textbox then want to add this data in grid

excelcol1  excelcol2
   345        abc
  1234        abc

after adding textbox data in grid .. grid looks like this

Column3 Column4 excelcol1  excelcol2
123     345     345         abc
1345    235     1234        abc

how i do this ?

What I have tried:

when i do this

Protected Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
       Dim test As New BoundField()
       test.DataField = "New DATAfield Name"
       test.HeaderText = "New Header"
       gv_Receipts.Columns.Add(test)
   End Sub

this add only header where as i want what ever the data in textbox e..g data in textbox is like this

excelcol1  excelcol2
   345        abc
  1234        abc

then i want to this data with columnnames in grid

how i do this ?