close vs dispose behavior problem

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C#

hello all,

when c# call variable update from child form to parent (delegate) this.dispose(); in a child dialog form, when it closing the it parent form blink like reload or refresh the parent form. but it not happening with this.Close(); . it just update the variables and close the child form.

01. can i use this.close() instead of this.Dispose(); ?
02. is it cause to gain application memory in time?
03. or what is the proper way to do this.?

Note: My application is POS application that Parent form is invoice and child dialog form for unit quantity change

please refer this video this video child dialog form close with this.close(); the problem happening only use this.Dispose() as close dialog form only;

http://www.youtube.com/watch?v=MgRQMBY_ZIc[^]