format number in C# -

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possible duplicate:
.net string.format() add commas in thousands place number

how format number 1234567 1,234,567 in c#?

for format options int32.tostring(), see here or here.

for example:

string s = myintvalue.tostring("#,##0");

the same format options can use in string.format, in 

string s = string.format("the number {0:#,##0}!", myintvalue);

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