Stuck finding specific String in a DataGridView

[Ploxinatous]

Hello,

I have a DataGridView on my form that is populated with data from a website table.
Now I would like to be able to search for a specific String or Value in the 'entire' grid.
When the String is found, I would like to get the index of the row it was found on.

I've tried several methods, none of them seem to work, I always get the error Object is not an instance...
Like this piece of code below which should paint the cell of the searched string - that I've put into tb1 - yellow, but each time I get the same error.

Dim searchedText As String = tb1.Text
Dim gridRow As Integer = 0
Dim gridColumn As Integer = 0
        For Each Row As DataGridViewRow In dgv.Rows
            For Each column As DataGridViewColumn In dgv.Columns
                Dim cell As DataGridViewCell = (dgv.Rows(gridRow).Cells(gridColumn))
                If cell.Value.ToString.Contains(searchedText) Then
                    cell.Style.BackColor = Color.Yellow
                End If
                gridColumn += 1
            Next column
            gridColumn = 0
            gridRow += 1
        Next Row

In this case the error is on the following line:

If cell.Value.ToString.Contains(searchedText) Then
Object reference not set to an instance of an object.

I even tried like every code snippet I could find, modified them to my needs, but I keep getting the same error.

Is there anything I did wrong with my DataGridView?

[si_the_geek]

The implication is that there is no value in the cell (and therefore the value cannot be converted to a String).

Try this modified version:

If cell.Value IsNot Nothing AndAlso cell.Value.ToString.Contains(searchedText) Then