在VB.net中从datagridview中搜索要显示为msgbox的值

Dim targetValue As String = "要搜索的值"
Dim foundValue As String = ""

For Each row As DataGridViewRow In dataGridView1.Rows
    For Each cell As DataGridViewCell In row.Cells
        If cell.Value IsNot Nothing AndAlso cell.Value.ToString() = targetValue Then
            foundValue = cell.Value.ToString()
            Exit For
        End If
    Next
Next

If Not String.IsNullOrEmpty(foundValue) Then
    MessageBox.Show(foundValue)
End If