Value in textbox 2 shouldn't be greater than in textbox 1

Hello everyone, Actually i have 2 textboxes textbox 1 textbox 2 So basically textbox1 display the sum of a column in database thus the value in the textbox 2 shouldn't be greater than the value in textbox 1. an error should be displayed if ever a user is trying to insert a value in textbox 2 greater than the value displayed in textbox 1. can someone pleaseeee helpp how do i do this in vb.net