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```DateTime datenow = DateTime.Now;
int age=0;
age =Convert.ToInt32(ddlyear.SelectedItem.Text).ToString();
int result = 0;
result =Convert.ToDateTime(datenow).ToString() - Convert.ToInt32(age).ToString();
txtage.Text = result.ToString();```
Posted 12-Jan-13 21:19pm
Updated 12-Jan-13 21:51pm
v2
jibesh 13-Jan-13 2:41am

what are you trying to do? calculate the age difference?
Dharmendra-18 13-Jan-13 2:44am

can you elaborate your question for better solution.

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## Solution 1

It looks like your trying to get the age in years using DateTime.Now and the birth date.

This will do just that.

```DateTime today = DateTime.Today;

int calc1 = (today.Year * 100 + today.Month) * 100 + today.Day;
int calc2 = (dateOfBirth.Year * 100 + dateOfBirth.Month) * 100 + dateOfBirth.Day;

int ageInYears = (a - b) / 10000;

txtage.Text = ageInYears.ToString();
```

But since the title of your question is "How i convert dataetime to int and string to Int" this is the following

```//Convert DateTime To String
DateTime now = DateTime.Now;
string nowString = now.ToShortDateString();
//Convert String To Int
int value1 = 22;
string value1Converted = value1.ToString();
```
v2
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## Solution 2

The code has serious issues it wont even compile.You are totally confused with the conversions. I would suggest understand the basics of assignment operations too.

you are trying to store a string data into an integer variable 'age' at the following location which is wrong you never store a string into an int.
```//wrong code
age =Convert.ToInt32(ddlyear.SelectedItem.Text).ToString(); //compiler error
//Correct Code
age = Convert.ToInt32(ddlyear.SelectedItem.Text); // is enough

//this code also throws compiler error,
result =Convert.ToDateTime(datenow).ToString() - Convert.ToInt32(age).ToString();
```

Try this
```DateTime now = DateTime.Today;
int age = now.Year - bday.Year;

calculate-the-difference-between-two-dates-and-get-the-value-in-years[^]
v2
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## Solution 3

You seem to have little understanding of the C# type system[^].

You seem to try to calculate a start date/time by subtract some "age" from "now".
What is "age"? seconds, minutes, hours, days, weeks, monts, years, centuries, mayan-cycles ;-)...?

Anyways: when calculating with times, you need to understand the difference between
- a point in time (like "now", "yesterday", "last year", etc.)
- and a duration (like "1 hour", "20 years", etc.).

Durations can be added/subtracted from each other, resulting in a new duration.
Adding/subtracting two points in dime result in a durations.
Adding/subtracting a duration to/from a point in time gives a new point in time.

`DateTime` denotes a point in time.
`TimeSpan` denotes a duration.

In your code, I assume "age" to be a duration.
1) set the point in time variable "now" to `DateTime.Now`
2) parse the "duration" input text into a `TimeSpan` (you need to decide on the right unit)
3) subtract the "duration" from "now"
4) convert the result to the desired point in time format (e.g. year only) and assign that to your text output variable

Cheers
Andi

PS: Strongly recommend to use `TryParse(...)` instead of any `Convert.XXX(...)` or `Parse(...)` methods. Reason: user input is potentially broken.

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