read Text File and Make Changes c# -

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i want read text file contains

<customername>@coustomername</coustomername> <customeraddress>@customeraddress</customeraddress> <customermobileno>@customermobileno</customermobileno> <payment>@payment</payment>

replace @coustomername coustomer name passes during run time

till use 

string readfile = file.readalltext(path); regex.replace(readfile , "@coustomername ", objproposar.firstname);

this works need make changes in coustomer address, mobile no etc how can

why regex, simple string.replace job:

string oldtext = file.readalltext(path); string newtext = oldtext.replace("@coustomername", objproposar.firstname); // other ... file.writealltext(path, newtext);

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