Gridview runtime generated textbox in Edit templete validation for range.

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Gridview

Dear All,

I am doing the gridview runtime generated textboxes. It contain one lable and 3 textboxes. Which should accept only numeric value. But I want to validate that textboxes. Such as followes:-

=================================
Slab Type | FROM| TO|Commission|
================================
FIRST | 5000|6000|2.5 (Validation required for this line from
should be lesser then TO value)
================================
SECOND |7000|8000|1.5 (Validation required for this line is range should
be bigger then first line and again from is lesser
then to value)
================================
THIRD |9000|10000|0.5 (Validation is same as 2nd line)

How can I do this validtion. Please help me out in this. I am using VB.net.
Thanks in advance.
With Regards,

Pallavi Modak