Get nth number of sets from user in proper set format in C#

Question

how to take nth number of sets from user using string type list in C#. 
Each set should be in this format {1, 2 , 3, ab,....nth }.
User can enter nth number of item in each set
then count the number of item in each set
Waiting for you answers 

Answer 1

I think you still not got my point. okay once again i explain you what i want.
User Enter set in WPF window in this format e.g {1,2,3,ab},{ab,cd,1,2}.
User can enter nth number of set.
User can enter nth number of elements\ items in each set.
Count the number of elements in each set.
Hopefully now you got my point
If I understand you correctly, you want to get the number based on the string like "{1,2,3,ab},{ab,cd,1,2}". Maybe you could try Regular Expression:
https://msdn.microsoft.com/en-us/library/az24scfc%28v=vs.110%29.aspx
For example this code snippet is able to count the set numbers and element numbers for you:
string input = "{1,2,3,ab},{ab,cd,1,2}";
string pattern1 = @"{.*?}";
string pattern2 = @"\w+,?";
Regex reg = new Regex(pattern1);
MatchCollection mc1 = reg.Matches(input);
Console.WriteLine("Number of set:" + mc1.Count);
for (int i = 0; i < mc1.Count; i++)
reg = new Regex(pattern2);
MatchCollection mc2 = reg.Matches(mc1[i].Value);
Console.WriteLine("Set " + (i + 1) + " element number:" + mc2.Count);
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