.net - InvalidCastException Error With Clearing Value Of Date Picker?
Feb 20, 2012
I use code such as this to clear out the values in several text boxes: Private Sub RibbonButtonInsert_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RibbonButtonInsert.Click
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Because the date picker control did not clear out like the other controls did, I tried:
DatePickerDateOfBirth.Value = ""
but it does not clear out. Instead, I get an "InvalidCastException". show me what coding I need to properly clear out the value in this data picker?
i am using date time picker and i am selecting 1 date from calender.after selection of that date i want to refresh date time picker i.e. it should display todays date.
I have an Sql server 2005 table called Emploeefl with 2 fields, EmployeeCode and Date of Birth. The data type for the date of birth is Datetime. I have a Date time picker on a vb.net 2005 form called dtDateOfbirth. When I click on the save button I get the error message "Conversion from string 'yyyy/MM/dd' is not valid. Below is the code
Dim newQE_Date As Date newQE_Date = Format(Me.dtDateOfBirth.ToString, "yyyy/MM/dd") 'newQE_Date = String.Format("2008/09/10", "yyyy/MM/dd")
The problem that I'm having is that when I try to select a different date, the text doesn't go away. That may make no sence, but let me tell y'all what I've done.
1: Created a GroupBox 2: Put a DateTimePicker in the GroupBox 3: Put TextBoxs in the GroupBox 4: Changed the DateTimePicker to look like this: A)Checked - False B)Allow Drop - True
I thought that if I changed that, then the text in the text box would go to that specific date. It didn't do that, it just stays the same. What I'm trying to do is enter text in say 3/7/11 and when I choose date 6/12/12 it will display blank text boxes for me to enter something different.
I have a date entered in from at DateTimePicker (dtDate.Value) and am writing it to an access database. This insert code works without the date, but not with it.
I am having a bit of trouble with using the date/time picker in a project.It is a program for calculating travelodge hotel accomodation prices. The price for a weeknight is 40 but weekends increase to �50.The code which I wrote is this:
For i As DayOfWeek = dtpArrival.Value.DayOfWeek To dtpDeparture.Value.DayOfWeek If dtpArrival.Value.DayOfWeek = 1 Or 2 Or 3 Or 4 Then PriceDecimal = PriceDecimal + 0[code].....
It does not work obviously because I am using the date/time picker for arrival date only. I think I need to use some other value which i would presume is something like "If DayOfWeek = 1 or 2 or 3...." but this will not work.
I have create a Car Rental application, where, based on two DateTimePickers, the number of days and, by extension, the total cost of the Rental can be calculated. I managed to get my DTPs working without much problem, however, my Min/Max dates do not seem to function.
Also, I want to create a condition where if the user returns the car on the same day, they only pay 60 percent of the normal cost. I have a basic idea of how to do this, but, once again, I am not quite able to get it to work.
Here is my code:
Private Sub Calculate_cmd_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Calculate_cmd.Click
'Declare Variables for DTP Calculations. Dim DatePicked As DateTime = Picked_dtp.Value Dim DateReturned As DateTime = Returned_dtp.Value Dim intPicked As Integer Dim intReturned As Integer Dim intDays As Integer Dim intRate As Integer Dim intTotal As Integer
' Set the MinDate and MaxDate. Picked_dtp.MinDate = DateTime.Today.AddYears(-1) Picked_dtp.MaxDate = DateTime.Today Returned_dtp.MinDate = DateTime.Today.AddYears(-1) Returned_dtp.MaxDate = DateTime.Today
'Read Data off of DTPs. intPicked = DatePicked.Day intReturned = DateReturned.Day
i have a problem on getting the values of it because of the same values such as the same parameter like @cdate_time_log, because i wanted to filter date through the use of date picker
Public Function _spselect_borrowerlog_fromto(ByVal cdate_time_log As String, ByVal cdate_time_log1 As String) As Boolean Dim cmd As SqlCommand Dim da As SqlDataAdapter
we r trying to insert date from datetime picker into mssqlserver 2005 but it also enter defult time(00:00) with it in database. using we want only date... & xyzdtp.value.date &
I'm using vb.net, in which i have a date time picker. I need to get a message when i change to date.I had done it with TextChanged event,But when i click the selection button of datetime picker the message is asking two times.How can i over come this.The code that i write in text changed events is as follows:
I am using date and time picker to get current date but when i get date from date and time picker first time it gives me current date and time i save the record and when i try to get date and time second time it does not work
How can i assign value to a Date Time Picker object.
My scenario is this:
I have a dtp that handles timeIn and timeOut. I want that if my Restday check box is checked, my Timein and Timeout will be set to 0000.
Here's my
Private Sub chkRestDay_CheckedChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chkRestDay.CheckedChanged If chkRestDay.Checked Then
i can't seem to get it the timers flow could anyone teach me how to use it for example the form would show up if the date and time in my computer matches with the time on my database im using vb.net2008 and mysql express for my db can't get it
i have a problem regarding my project, its a library system to be exact here the flow of the problem in the library there is a borrowing time and a returning time of books every hours that the student failed to return the book it will cost 5 pesos(philippine money)and in a day it will cost 40 pesos.. 9 am to 5 pm is the counted hours of penalty, night is not included in the computation of penalty.. my borrowing form is in datagrid view.. is it good to do this in details view how to compute in date and time format?
Does anyone know how I would go about embedding a DateTimePicker in my DataGridView?I've tried this piece of code but it looks like DateTimePicker isnt a valid GridView control - is it a lot of hassle trying to implement this?
Dim calendar As New DateTimePicker totalKM = New DataGridViewTextBoxColumn() totalKM.Name = "Total KM"
I have created a text box....a button and a date time picker control. I have showed the calander control on click of the button event....when a value is selected in the datetimepicker the value should be showed in the text box...I have done this....in the datetimepicker value change event
But then I want that the datetimepicker control to hide again...but this code I cant write in the value change event since if I write the hide code in datetimepicker value change event it will hide it every time...cant write in lost focus also since it will have to wait till the focus is lost. cant write the code in text box value change event since the value will be changed after every click in datetimepicker I want to write the code when the value in calander is doubleclicked...
Sub getReadings() Dim intRead As Integer Dim dateRead As Date intRead = CInt(txtReading.Text) dateRead = txtDateTime.Value comes from a date/time picker txtTest.Text = dateRead
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lstListView is just a standard lstbox. Have no idea why this is happening or how to fix it. I can post the rest of the code if needed.
i am trying to use a date time picker in an input box to search for records in a database via the date. However i do not know how to get a date time picker into an input box.
I want to get the date in a date and time picker and convert it to check if a row in my database is either < or > than a than a DepDate field in my database.The SQLServer field type is Date... HOw can I do this?
