set control to stay with last entered values

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C#

Hi,I did a registration form with two modes.
One for registration,And another for edit registration,.;
When i am doing edition, i gets already entered values of A Particular Person details in corresponding
controls from database.i have a button for check availability,By clicking this my page get reloaded and
filling database values again instead of changed value,I want a solution for keeping last entered value
in particular controls or give me any other idea for not refreshing changed controls....... Thanks in Advance