Series of Numbers Validation in Win C# application

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C#

Windows

Hi

I have a series of number i need to validate the series such that it must can't consider number inbetween series.. for eg i have 10 to 20 numbers in of the coloum of gridview in the format of 10-20 if again if i add to grid as 15-20 or 5 to 25 or 11 to 15 it must not consider..

for example
Column
10-20
25-30
40-60
100-150

If I need to add one more record to the grid it should not consider 10-20 or 28-30 or 45-55