How to calculate difference between two dates in textboxes in C#.

This can be easily accomplished using an object of Type "TimeSpan". For example: let's assume that we want to know the number of days between the max. and min. values for the DateTime Type and show it in a Console window, then I may write something like:

DateTime d1=DateTime.MinValue;
DateTime d2=DateTime.MaxValue;
TimeSpan span=d2-d1;
Console.WriteLine( "There're {0} days between {1} and {2}" , span.TotalDays, d1.ToString(), d2.ToString() );

Let's say that your DateTimes are called start and end.
DateTime start = new DateTime(2009, 6, 14);
DateTime end = new DateTime(2009, 12, 14);

We have established our DateTimes to June 14, 2009 and December 14, 2009.

Now, let's find the difference between the two. To do this, we create a TimeSpan:
TimeSpan difference = end - start;

With this TimeSpan object, you can express the difference in times in many different ways. However, you specifically asked for the difference in days, so here's how you can get that:
Console.WriteLine("Difference in days: " + difference.Days);

Thus, the property is called TimeSpan.Days.

try this:

IFormatProvider theCultureInfo = new System.Globalization.CultureInfo("en-GB", true);
DateTime from_date = DateTime.ParseExact(txt_from_date.Text, "dd/MM/yyyy", theCultureInfo);
DateTime to = DateTime.ParseExact(txt_to_date.Text, "dd/MM/yyyy", theCultureInfo);
txt_total_days.Text = ((to - from_date).TotalDays).ToString();

if u any problm, please post it.

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You can find more also

consider Dates in both text boxes , now i have to get number of days when i subtracted from one another.

DateTime dt1=Convert.ToDateTime(Textbox1.text);
DateTime dt1=Convert.ToDateTime(Textbox1.text);
TimeSpan ts=dt.subtract(dt1);
int NoOfDays=dt.Days;
textbox3.text=NoOfDays;

May be It will help you.

DateTime dt1=Convert.ToDateTime(TextBox1.Text);
DateTime dt2=Convert.ToDateTime(TextBox2.Text);
TextBox3.Text=""+((dt1>dt2)?(dt1-dt2).TotalDays:(dt2-dt1).TotalDays);

Happy Coding

private void button1_Click(object sender, EventArgs e)
        {
            TimeSpan m1stDate = dTP1.Value- dTP2.Value;
            textBox1.Text = m1stDate.ToString();
        }