Format String as phone number in C#

Question

I have a string value 1233873600 in C# and I have to convert it to 123-387-7300 in C#

Is there any in-built function which will do that in c#?

Answer 1

Cast your string to a long and use the format "{0:### ### ####}";

string.Format("{0:(###) ###-####}", 1112223333);

Answer 2

string phone = "1233873600".Insert(6, "-").Insert(3, "-");