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How to convert datetime in C# [closed]

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I have to edit textbox field and update in Database.
DateTime d2 = Convert.ToDateTime(txteventdate.Text.ToString());
ds = obj.EditEvents(Id, txtname.Text, d2, txtinfo.Text, txtvenue.Text);
if (ds.Tables[0].Rows.Count >= 0)
{
lblid.Text = CommonFunctions.DecryptStr(Request.QueryString["id"].ToString());
txtname.Text = ds.Tables[0].Rows[0]["Name"].ToString();
txtinfo.Text = ds.Tables[0].Rows[0]["info"].ToString();
txtvenue.Text = ds.Tables[0].Rows[0]["venue"].ToString();
txteventdate.Text = ds.Tables[0].Rows[0]["Eventdate"].ToString();
}
The textbox value is "2018-04-19 21:34:00.000".
I tried several times with all possible solutions which I know but it is giving me below error.
String was not recognized as a valid DateTime.
Thanks in Advance.

Below code converts your string to DateTime object. If you want to use the exception safe then use DateTime.TryParseExtract
var date = DateTime.ParseExact(ds.Tables[0].Rows[0]["Eventdate"].ToString(), "yyyy-MM-dd HH:mm:ss.fff", System.Globalization.CultureInfo.InvariantCulture);

Please do not convert 'unknown user input' data directly into another type. Try with DateTime.TryParse. Further you could check in advance if even something was entered:
if(string.IsNullOrEmpty(txteventdate.Text))
{
MessageBox.Show("Date is necessary!");
return;
}
if(!DateTime.TryParse(txteventdate.Text, out DateTime parsedDateTime))
{
MessageBox.Show($"Invalid {txteventdate.Text}!");
return;
}
If you want to parse a specific date format you could check for DateTime.TryParseExact. The msdn article has got nice examples at the bottom.

some rows are missing on results of my query [closed]

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I want to get report between 2 dates with PersianCalendar and I've already converted the dates. It does not show me the data about last day
This is my code:
public ActionResult FilterDate(DateFormViewModel model)
{
PersianCalendar pc = new PersianCalendar();
var dateFrom = pc.ToDateTime(model.FromYear, model.FromMonth, model.FromDay, 0, 0, 0, 0);
var dateTo = pc.ToDateTime(model.ToYear, model.ToMonth, model.ToDay, 0, 0, 0, 0);
var filter = db.Parts.Where(s => s.CreateDateTime >= dateFrom && s.CreateDateTime <= dateTo).ToList();
return View("Index", filter);
}

You're searching from midnight of the start date to 12 AM of the end date. You want to search from midnight of the start date to 11:59:59 PM of the end date.

You are missing data on the last day, right? (15 mordad)
The reason is that you are looking to the same day. having <= in the query does not help you.
for instance 1395/5/15 01:00:00 is greater than 1395/5/15 (your dateTo) and therefore it will not show up in the results
you have to check it with next day
var filter = db.Parts.Where(s => s.CreateDateTime >= dateFrom && s.CreateDateTime < dateTo.AddDay(1)).ToList();

Regex between two times [closed]

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I have a file with a few million lines in them.
Every line starts like this:
2016/04/05 11:20:43.293
I would like a regex (or other option?) to get all the lines that fall between two times. (for example between 11:20 and 11:25)
Also, if it's possible to match one or more words in those lines, that would be helpfull as well. However, perhaps a regex isn't the best way to go then?

You could use DateTime.TryParseExact and File.ReadLines with this LINQ query:
string format = "yyyy/MM/dd HH:mm:ss.fff";
DateTime dt;
var relevantLines = File.ReadLines(path)
.Where(l => l.Length >= format.Length
&& DateTime.TryParseExact(l.Substring(0, format.Length), format, DateTimeFormatInfo.InvariantInfo, DateTimeStyles.None, out dt)
&& dt.TimeOfDay >= start && dt.TimeOfDay <= end);

First you have to use a Regex:
Regex TimePattern = new Regex("\\d{2}:\\d{2}.\\d{3}");
Parse the matches to datetime and check if the time is valid:
foreach (Match M in TimePattern.Matches(FILECONTENT))
{
DateTime Dt = Convert.ToDateTime(M.groups[1]));
//Now you can check if the time "Dt" is between 11:20 and 11:25
}
To compare the time you could use (like described in Is there BETWEEN DateTime in C# just like SQL does?):
public static bool Between(DateTime input, DateTime date1, DateTime date2)
{
return (input > date1 && input < date2);
}

DateTime to int [closed]

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How to covert DateTime to int
DateTime now = DateTime.Now;
int va = now.Year;
// error here
int vd = int.Parse(mYear.Value.ToShortDateString());
result = Convert.ToString(va - vd);
Input string was not in a correct format

Assuming mYear is of Type DateTime - Just do it like you did with now:
int vd = mYear.Year;
If it's a string like "2014", use something like:
DateTime.ParseExact(mYear, "yyyy", System.Globalization.CultureInfo.InvariantCulture, System.Globalization.DateTimeStyles.None);

Not sure what Parse is going to do with escape chars.
// The example displays the following output:
// Displaying short date for en-US culture:
// 6/1/2009 (Short Date String)
// 6/1/2009 ('d' standard format specifier)
# ElGavilan commented to the same effect while I was posting.

addition of two month and year in asp.net with c# [closed]

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addition of two month and year in asp.net with c#.
if i select any one Month/year: like march/2014 and add(+) 12 month,
so it should be give the February/2014.
In this we can see Loan Period is: 12 (month) and below we can see loan start from month: 07(july/2014) so end of the load should be 06/2015. and the both month are in textbox it means they are string.

DateTime dt = new DateTime(2013, 1, 1);
dt.AddYear(1);
dt.AddMonths(2);
//Date is 2014, 3 (March), 1
Alternatively if you wish to substrat years and months you can use:
dt.AddYear(-1);
dt.AddMonths(-1);
//Date is 2013, 2 (February),1

Here you will not get 02/2015 if you add 12 months in 03/2014. You will get 03/2015 in result as shown below.
var inputString = "march/2014";
DateTime dt = DateTime.ParseExact(inputString, "MMMM/yyyy", CultureInfo.InvariantCulture);
var result = dt.AddMonths(12).ToString("MMMM/yyyy");
Will result in => "march/2015"

It seems that yous should add -1, not 12 months (if you want to get February from March):
String fromDate = "march/2013";
// result == "February/2013"
String result = DateTime
.ParseExact(fromDate, "MMMM/yyyy", CultureInfo.InvariantCulture)
.AddMonths(-1)
.ToString("MMMM/yyyy", CultureInfo.InvariantCulture);
In case that you want to add a year and two months (and so your example is incorrect)
String fromDate = "march/2013";
// result == "May/2014"
String result = DateTime
.ParseExact(fromDate, "MMMM/yyyy", CultureInfo.InvariantCulture)
.AddYears(1)
.AddMonths(2)
.ToString("MMMM/yyyy", CultureInfo.InvariantCulture);