how to show checkbox list items in one line using C#

Question

I have written a code for the same.

private void btnColumnWrite_Click(object sender, EventArgs e)
{
string s = "";
for (int i = 0; i < checkedListBox1.Items.Count; i++)
{
if(checkedListBox1.GetItemChecked(i))
{
s += checkedListBox1.Items[i] +",";
}
}
StreamWriter SwriteData = new StreamWriter(@"C:\Users\user\Desktop\ReportTmplate\Test.txt");
SwriteData.WriteLine("(" + s + ")");
SwriteData.Close();
}

When I execute this above code I got solution like wise : T1,T2,T3,T4,

 

But I want this like - T1,T2,T3,T4

 

I want to remove the last comma "," Symbol which is coming after T4 (Means last item selection), So please guide me on how to avoid this last ",".