Check compare the value of datagridview with a textbox.text ?

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VB

Hi,
I'm trying to write a function that gets the text of a textbox and checks it with all values of a datagridview,
The problem i face is that the comparison is true and the column value in datagridview is "John Smith" and the textbox.text is "Smith" when I trace it I can see it, but the code does not work and the row visibility is still true.
Here is the code:::

For Each row As DataGridViewRow In dgFirst.Rows
                If (row.Cells.Item("Column2").Value.ToString().Contains(TextBox1.Text)) Then
                    row.Visible = False
                End If
            Next

A similar code to it is working properly:

For Each row As DataGridViewRow In dgFirst.SelectedRows
                dgFirst.Rows.Item(row.Index).Visible = False
            Next

What I have tried:

I'm still working on it, and yet i couldn't find the answer.

(2nd update)
It's like the line below reutrns a false anser:

(row.Cells.Item("Column2").Value.ToString().Contains(TextBox1.Text))