visual studio - richTextBox make sum of all lines in c# -

is there way make sum of lines in richtextbox? lines in richtextbox numbers. want if richtextbox has 10 lines random numbers 10 lines must added each other. ex.:

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10

then must happen is: 1+2+3+4+5+6+7+8+9+10 , answer appears in messagebox in case: 55

greetings michielvk

try this:

messagebox.show(string.format("sum of numbers {0}",     richtextbox1.text.split('\n').select(number => convert.toint32(number)).sum())); 

split text on new line character, convert string array numbers, sum , display in messagebox.

step step solution:

string[] stringarray = richtextbox1.text.split('\n');  int sum = 0; foreach (string element in stringarray) {     sum += convert.toint32(element); }  messagebox.show("sum of numbers " + sum);