How can sum value from txt file through c#

private void button1_Click(object sender, EventArgs e)
{
string s;
string[] line;
int sum=0, value=0;
StreamReader sr = new StreamReader(@"c:\temp\f.txt");
while((s = sr.ReadLine()) != null)
{
line = s.Split(':');
int.TryParse(line[1].Trim(), out value);
sum += value;
}

textBox1.Text = sum.ToString();

}

People have answered questions for you so, It would be nice if you accepted some answers otherwise you may not get any.