How to Select row using checkedit gridcontrol devexpress?

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C#

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DevExpress

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i have a winfrom using C# in my coding , and i use gridcontrol devexpress 2010 to show data contact list.

here is my form

after select those list i get the value from gridcontrol that i select and press button OK to get it. I don't know the code.

anyone can suggest me,....thanks