Public Class Form1
    Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As _
      System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
        If e.KeyCode = Keys.F10 Then
            TextBox1.Text = "Test"
        End If
    End Sub
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles MyBase.Load
        Me.KeyPreview = True
    End Sub
End Class