>Hi there! In the Init method of form I put values from my table to textbox. Next code: textbox.value = table1.field1.In Form Designer I put the initial value 0.0 in textbox.value. But when value of table1.field1 is null everything what I enter from keyboard has character datatype, but I steel need numeric.

Why not bind your controls to the fields using ControlSource? That shoudl take care of it.