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Set MinValue in datetimepicker in c#

Hi I want user to select dates which is 6 months or higher than the current date but I don't know where should I start.
Please help me fix this. Thank you!

Please check below solution
DateTimePicker dateTimePicker= new DateTimePicker();
dateTimePicker.MinDate = DateTime.Now;
dateTimePicker.MaxDate = DateTime.Now.AddMonths(6);

You can take the min DateTime value. Try like:
var minDate = DateTime.MinValue;

Textbox textmode is DateTimeLocal

I have a textbox and i would love it to be formatted. fortunately for me, i can get this done by changing the textmode = DateTimeLocal. Exactly what I want. Additionally, I would like to load this textbox with default values rather than leaving it with dd/mm/yy __:__:__ . I can change the text if it is a regular textbox (single mode) or even a datetime textbox. but i cannot change it with DateTimeLocal mode. some help please. thank you.

You will have to format the DateTime to a valid Date and Time string that can be parsed, here is one that works:
txtDateTimeLocal.Text = DateTime.Now.ToLocalTime().ToString("yyyy-MM-ddTHH:mm");
For more details on what other attributes you can set, see: http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#local-date-and-time-state-(type=datetime-local)

Try setting the whole datetime format including seconds and milliseconds, worked for me.
txtStartTime.Text = DateTime.Today.ToString("yyyy-MM-ddTHH:mm:ss.ss");

If you want to set a TextBox's DateTime dynamically from a database then you can use this code:
DataTable dtTemp = (DataTable)ViewState["DataSet"]; // this are temporary table
TextBox txtFromDate = (TextBox)gridEditBloackHomework.Rows[e.NewEditIndex].FindControl("txtFromDate");
TextBox txtToDate = (TextBox)gridEditBloackHomework.Rows[e.NewEditIndex].FindControl("txtToDate");
string c = dtTemp.Rows[e.NewEditIndex]["FromDate"].ToString();
DateTime FromDate = Convert.ToDateTime(dtTemp.Rows[e.NewEditIndex]["FromDate"]);
DateTime ToDate = Convert.ToDateTime(dtTemp.Rows[e.NewEditIndex]["ToDate"]);
DateTime dtFromDate = FromDate.AddHours(-2);
DateTime dtToDate = ToDate.AddHours(-2);
txtFromDate.Text = dtFromDate.ToLocalTime().ToString("yyyy-MM-ddTHH:mm").ToString();
txtToDate.Text = dtToDate.ToLocalTime().ToString("yyyy-MM-ddTHH:mm");

Replace the timeValue in a datetime insted of Add the time

In a WPF Application, I have a DateTimePicker.
I save on a DateTime variable, the DateTimePicker value with a time.
dDate = DateTimePicker_Date.SelectedDate.Value.Add(TimePicker_Heure.Value.Value.TimeOfDay);
This code is Ok when dDate is null, but, when i update the DateTimePicker, the Time is Added.
So,if my DateTimePicker is : 1/2/2013 with 01:20.
At the first :
dDate = DateTimePicker_Date.SelectedDate.Value.Add(TimePicker_Heure.Value.Value.TimeOfDay);
All is ok, but, if i re-execute this line :
dDate = DateTimePicker_Date.SelectedDate.Value.Add(TimePicker_Heure.Value.Value.TimeOfDay);
The dDate value will be : 1/2/2013 with 02:40.
Could anyone tell me how solve this problem please?

Add to the Date property of the DateTime:
DateTimePicker_Date.SelectedDate.Value.Date.Add(
TimePicker_Heure.Value.Value.TimeOfDay);
The Date property has 00:00:00 time.

how to set the dayTimePicker to the present day when the program run (c#)?

How do i set the dayTimePicker default value to the date when i run the program (present day)?

for current time and date
dateTimePicker.Value = DateTime.Now;
for current date
dateTimePicker.Value = DateTime.Today;

You can explicitly set the Value property of the control to DateTime.Today.
myPicker.Value = DateTime.Today;
However, this is not needed - as the MSDN page mentions:
If the Value property has not been changed in code or by the user, it is set to the current date and time (DateTime.Now).

datetimepicker.value = DateTime.Now;

You should do this:
yourDateTimePicker.Value = DateTime.Today;

The default value of the control is Today
From MSDN:
If the Value property has not been changed in code or by the user, it is set to the current date and time (DateTime.Now).

How to show the Birthdate in mm/dd/yyyy format if year is separated from it?

I have a modalpopup inside it I have checkboxes,when I check the checkboxes and save the changes there is a dynamically created table with dynamically generated labels.I have a checkbox Birthdate inside the modal popup which shows the mm/dd only.And another checkbox below it that will show the year only, and will be visible if Birthdate checkbox is checked.
I want to show that if Birthdate checkbox is checked and the save button is clicked then insisde the dynamic table it will show the mm/dd only.And if year checkbox is checked ,and the save button is clicked, then it will show the Birthdate inside the dynamically created table as mm/dd/year.

seems like there's multiple questions here - not sure which one(s) you're asking.
1) how to format a date in format X or Y?
- You can use String.Format("{0:MM/dd}", yourDateTime) or yourDateTime.ToString("MM/dd") or whatever for that case. Add on /yyyy for the other case.
http://msdn.microsoft.com/en-us/library/8kb3ddd4.aspx
2) how to conditionally display format?
- various ways, but a simple one that I think would work fine is to just add into Page_Load the check, so something like: string format = cond ? "MM/dd/yyyy" : "MM/dd"; and then checkbox.Text = yourDateTime.ToString(format);
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.checkbox.text.aspx
3) how to get the display to change on checkbox change?
- #2 combined with adding AutoPostBack=true on your checkbox(es)
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.checkbox.autopostback.aspx
If you can further clarify the question, in particular what parts of what you're trying to do you're having trouble with, it may help us provide better answers :)

if (!Convert.IsDBNull(oReader["BIRTH_DATE"]))
{
DateTime dt = Convert.ToDateTime(oReader["BIRTH_DATE"]);
int date = dt.Day;
DateTime bd = Convert.ToDateTime(oReader["BIRTH_DATE"]);
int month = bd.Month;
lblBirthDate.Text += date + "/" + month;
DateTime dob = Convert.ToDateTime(oReader["BIRTH_DATE"]);
int year = dob.Year;
lblBirthYear.Text += year;
}