How to change Textbox font at runtime using vb.net

 
Following example shows how to change font of the textbox at runtime in vb.net

Example

Private Sub Button1_Click(ByVal sender As System.Object, _
                     ByVal e As System.EventArgs) Handles Button1.Click
        Dim objFont As System.Drawing.Font
        objFont = New System.Drawing.Font("Arial", 12, FontStyle.Bold Or FontStyle.Italic)
        TextBox1.Font = objFont
    End Sub

you can also use the FontDialog class for changing font, see this:

    Private Sub Button1_Click(ByVal sender As System.Object, _
                  ByVal e As System.EventArgs) Handles Button1.Click
        Dim objFontDlg As New FontDialog
        If objFontDlg.ShowDialog = Windows.Forms.DialogResult.OK Then
            TextBox1.Font = objFontDlg.Font
        End If
    End Sub