How to check if a value already exists in DataGridView?

I am trying to check each row in the DataGridView whenever I add an Item in order to avoid duplicates. But my code only allows me to check the first data I added.

Here is my code:

For Each row In BarcodePrintListGrid.Rows

    If Label44.Text = row.Cells("Barcode ID").Value Then
        MetroMessageBox.Show(Me, "Item Already Added", "System Information", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)

        Label47.Text = "None"
        Label44.Text = "None"
        Label42.Text = "None"
        Label31.Text = "None"
        Label40.Text = "0"
        TextBox1.Clear()

        Exit For

    Else
        BarcodePrintListGrid.Rows.Add(Label47.Text, Label44.Text, Label42.Text, Label31.Text, Label40.Text, 1)

        MetroMessageBox.Show(Me, "Item Added to List", "System Information", MessageBoxButtons.OK, MessageBoxIcon.Information)

        Label47.Text = "None"
        Label44.Text = "None"
        Label42.Text = "None"
        Label31.Text = "None"
        Label40.Text = "0"
        TextBox1.Clear()

        Exit For
    End If

Next

You have to wait until the loop has gone all the rows of your DataGridView before deciding to add the row to it or not.

Try with this code :

 Dim test As Boolean = False
    For Each row In BarcodePrintListGrid.Rows
        If Label44.Text = row.Cells("Barcode ID").Value Then
            test=true
            Exit For
        End If
    Next

    if test=false then
            BarcodePrintListGrid.Rows.Add(Label47.Text, Label44.Text, Label42.Text, Label31.Text, Label40.Text, 1)

            MetroMessageBox.Show(Me, "Item Added to List", "System Information", MessageBoxButtons.OK, MessageBoxIcon.Information)
    else
            MetroMessageBox.Show(Me, "Item Already Added", "System Information", MessageBoxButtons.OK, MessageBoxIcon.Exclamation)
    end if
     Label47.Text = "None"
     Label44.Text = "None"
     Label42.Text = "None"
     Label31.Text = "None"
     Label40.Text = "0"
     TextBox1.Clear()