how to split a string into three dimensional array

You seem to be a little confused, or you aren't explaining this very well - or I just don't know what teh heck you are talking about.

You initial version had you assembling a string out of selected items from your DataGrid, and now you need to split a string into three arrays.

What are you trying to do? What are the three arrays supposed to hold? How do you know where to split the string, and which array do you need to put the part into?

We are trying to help, but if you don't give us enough information we are just guessing!

Try to describe your problem, not your solution: What is the code meant to do rather than how it does it.

"Take selected Items from a DataGrid and put them into an array of rows, each holding an array of column data" might be a description - I don't know what you are trying to achieve!