How can i suppressed inputs?

how can we suppressed input in a textbox? in my previous work , i used this code to facilitate the suppression of the input in VB 6 KeyAscii = 0 , since the KeyAscii as an argument in Keypress Event is editable. but in VB.net a member KeyCode in System.Windows.Forms.KeyEventArgs is read only ..... can anyone help me guys! junmar