You have an array of strings to format as delimited text and possibly to store in a text file.

Using the static Join method of the string class, the array of strings can be easily joined in as little as one line of code. For example:

string[] infoArray = new string[5] {"11", "12", "Checking", "111", "Savings"};
string delimitedInfo = string.Join(",", infoArray);

This code sets the value of delimitedInfo to the following:

11,12,Checking,111,Savings

The Join method concatenates all the strings contained in a string array. Additionally, a specified delimiting character(s) is inserted between each string in the array. This method returns a single string object with the fully joined and delimited text.

Unlike the Split method of the string class, the Join method accepts only one delimiting character at a time. In order to use multiple delimiting characters within a string of values, subsequent Join operations must be performed on the information until all of the data has been joined together into a single string. For example:

string[] infoArray = new string[4] {"11", "12", "Checking", "Savings"};
string delimitedInfoBegin = string.Join(",", infoArray, 0, 2);
string delimitedInfoEnd = string.Join(",", infoArray, 2, 2);
string[] delimitedInfoTotal = new string[2] {delimitedInfoBegin, 
         delimitedInfoEnd};
string delimitedInfoFinal = string.Join(":", delimitedInfoTotal);
Console.WriteLine(delimitedInfoFinal);

produces the following delimited file:

11,12:Checking,Savings

See the “String.Join Method” topic in the MSDN documentation.