finding greatest number from text box using button

Since this sounds like homework, I won't give you code!
It's not difficult though:
1) Put a TextBox and a Button on your form. Give them sensible names - this is worth getting into the habit of right from the beginning.
2) Double click the button to create the default event handler - the click event. This will take you to the code.
3) Read the data from the Textbox.Text property[^], and use the string.Split method[^] to separate them at the comma.
4) Loop though each string in the separated list, converting it to an integer with the int.Parse[^] or int.TryParse[^] method. Compare it with the current maximum value, if it is creater, then it becomes teh current maximum.
5) After the loop, the current maximum is the largest number.

Hi,
This is the code to do that:

public int GetGreatest(string numbers)
{
   string[] arr = numbers.Split(',');
   Array.Sort(arr);
   return int.Parse(arr[arr.length-1]);
}

I hope it helps,
Cheers.

I think one important point is to compare after converting the number in text format to number.

string numbers = "22, 10, 1, 35, 20, 25, 85, 25, 100, 5";

var max1 = numbers.Split(',').Max (n => Int32.Parse(n) );
Console.WriteLine ("Max number compared as integer: " + max1);

var max2 = numbers.Split(',').Max (n=> n.Trim());
Console.WriteLine ("Max number compared as text: " + max2);

//Output
//Max number compared as integer: 100
//Max number compared as text: 85

this is because text will be compared from left to right, so 100 will come before 85.