VS 2010 - String Not Recognized As Valid DateTime
Jun 30, 2011
I am having a major issue understanding why this code runs fine once and then when run a second time causes the "String was not recognized as a valid DateTime." exception. This program loops through folders and subdirectorys and retrieves the file dates from the last modified date of the file , Its only when i click New Report to reset all the values in the settings which clears all object lists and resets all the other values that this issue occurs.
This is the value being passed to this function:
#6/14/2011 4:46:51 PM# (The file inside the subdirectory,s last modified date.)
The function is
Public Sub setFileDate(ByVal fileDate As DateTime)
'Format the datetime from the filedate to a UK culture.
Dim myDateTime As DateTime = DateTime.Parse(fileDate, ukCulture.DateTimeFormat)
'Set the current files date.
dFileDate = myDateTime.Date
[Code] .....
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Aug 4, 2011
I am trying to parse a date to a datetime picker but this error keeps on appearing "String was not recognized as a valid DateTime" The reason behind this is because the date format of the computer is "MM/dd/yyyy" whereas the date am passing is in this format "dd/MM/yyyy" Here is how I tried resolving the problem:
DTDateReceived.Value = Date.Parse(ListView1.Items.Item(ListView1.FocusedItem.Index).SubItems(7).Text)
The aforementioned error occurs
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Jun 1, 2011
working with dates is driving me mad I have the following function to parse al datetime strings in my project:
Public Shared Function ToDate(ByVal obj As Object) As DateTime?
If obj = String.Empty OrElse obj Is DBNull.Value Then Return Nothing
Return DateTime.Parse(obj.ToString)
End Function
Most of my date strings on my pc are "yyyy/MM/dd" and it parses fine. However on the server the dates are "dd/MM/yyyy".I tried this but it made no difference:
Public Shared Function ToDate(ByVal obj As Object) As DateTime?
If obj = String.Empty OrElse obj Is DBNull.Value Then Return Nothing
Return DateTime.Parse(obj.ToString, System.Threading.Thread.CurrentThread.CurrentCulture.DateTimeFormat)
End Function
on my pc if I assign DateTime.Now to a textbox I get 2011/05/31 08:02:00 AM for example. On the server I have my project the date displays as 31/05/2011 08:02:00 AM. Now I use objectdatasources to save the values to my database. Yesterday I was getting this error:Cannot convert value of parameter '' from 'System.String' to 'System.DateTime'until I formatted the date value like so:
Me.odsRates.InsertParameters.Add("CreatedDate", rt.CreatedDate.ToString("yyyy/MM/dd hh:mm:ss"))
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Mar 29, 2009
I am trying to write a bit of logic that compares a data against todays date in the row datarowbound event of a gridview. I think I am converting the row data item to datatype datetime but visual studio is telling me that I am not!
Protected Sub GvAdDetails_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles GvAdDetails.RowDataBound
If e.Row.RowType = DataControlRowType.DataRow Then
If DataBinder.Eval(e.Row.DataItem, "dateLimit").ToString <> "NULL" Then
Dim dateLimit As Date
[Code] .....
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May 25, 2011
We have data feed, a file with index values and dates (like the S&P 500, for instance). The dates are represented as YYYYMMDD. The Date.Parse() method doesn't understand this format, of course.I wrote a simple static method on a class to parse this, not a big deal, but it irritates the engineer in me that I can't figure out how to get the IFormatProvider functionality to work. All the examples deal with the FORMATTING step, not the PARSING step.So basically, I want to be able to say:
Dim d as DateTime = Date.Parse("20110522", New CustomFormatter())
and get the correct date value out of the Parse method.
Having implemented the IFormatProvider method on CustomFormatter, the GetFormat() method gets called with a System.Type of DateTimeFormatInfo, but I honestly have no idea what to do from there since all the example deal with formatting, not parsing. It doesn't matter if I return an object (self) or null I simply get "String was not recognized as a valid DateTime."
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Jun 29, 2011
I'm creating an XML file from values contained in a datatable. When I try to write an XML date value, I receive "String not recognized as a valid datetime. The dates that are stored in the datatable column is in this format "yyyymmdd". I tried to use XmlConvert.ToDateTime but I get a warning about the method being obsolete and I'm not sure what serialization mode I should use. How would I format the date from the datatable to MM/dd/yyyy and write to an XML file?
XmlWriter.WriteElementString("Add date", XmlConvert.ToDateTime(dr("Date_Added").ToString.Trim)))
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Mar 10, 2009
I want to convert mm/dd/yyyy to dd/mm/yyyy.My application is asp.NET with VB.I tried following code DateTime.Parse(oldDate.ToString("ddmmyyyy"))
But got the error: "The string was not recognized as a valid dateTime. There is an unknown word starting at index 2"
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Feb 5, 2012
I've been having several problems lately with clients that are using a different Windows Region setting than I am. The error is as follows:
The type initializer for 'InventoryDataTable' threw an exception. ---> System.TypeInitializationException: The type initializer for 'InventoryDataTable' threw an exception. ---> System.FormatException: String was not recognized as a valid DateTime.
The error occurs when users load the application and their region settings do not match my own. The application loads up a dataset and attempts to receive a small amount of data before allowing the user to log in. When this is removed, the problem occurs immediately after the user logs in to the app. I cannot seem to find the proper settings to force the user to use either my Region, or to allow the application to figure it out on it's own...
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Mar 3, 2009
Dim today As System.DateTime
today = System.DateTime.Now
Dim strDate As String = today.ToString("d")
[Code].....
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Jan 23, 2012
Need to convert this string:
Mon Oct 31 16:18:15 CDT 2011
Into a valid DateTime value.Have tried every variation of the date time styles with DateTime.Parseto no avail.
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Dec 3, 2009
I recently moved a webservice VB.net project from VS 2005 to VS 2008 and now a conversion I use to create a unique receipt number is no longer working.
The Format() function which is supposedly a Visual basic function gives the error:
'Format' is a type and cannot be used as an expression.
The Year() Function which is also a VB function gives the error:
Name 'Year' is not declared.
The Datetime() Function which is also a VB function gives the error:
'DateTime' is a type and cannot be used as an expression.
The actual code statement remains unchanged between the two web services but VS2005 compiles and VS2008 does not.
Dim julda As Long = CLng(Format(Year(oneRowDon.Item(8)), "0000") _
+ Format(DateTime("d", CDate("01/01/" _
+ Format(Year(oneRowDon.Item(8)), "0000")), oneRowDon.Item(8)) _
+ 1, "000"))
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Sep 15, 2011
I am currently in programming class and I have tried time and time again to complete a form called "theater revenue" that was assigned to me. Even though I have typed in a lot of code, it keeps telling me "Conversion from string "" to type 'Double' is not valid."
These are the directions: "A movie theater only keeps a percentage of the revenue earned from tiecket sales. The remainder goes to the movie company. Create an application that calculates and displays the following figures for one nights box office business at a theater. Assume the theater keeps 20% of its box office receipts. Use a named constant in your code to represent percentage."
Here is my code....
vb.net
Private Sub btnCalculate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalculate.Click
' Declare variables for the calculations.
Dim dblATS1 As Double
' Gross Adult Ticket Sales as Double
[Code] ......
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Apr 26, 2012
[code]I'm trying to leave the textboxes A, B and C EMPTY so an error message box will appear saying "You did not put any value in textboxes A" or "B" "C".. but my program works if you put a value in the three boxes.[code]
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Sep 1, 2011
I have a form, which holds several comboboxes, textboxes, checkboxes.I use an msaccess database to store the values into.When I enter text in a textbox and then click the save button I get the following error:conversion from string "" to type 'double' is not valid.But I really don't understand, the field of the database where the textbox text is being stored in is a text type.I searched google for it and the problem seems to be that the type of data from the textbox isn't the same as entered into the field of the database.But the strange thing is, is that as far as I can see, it is.[code]
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Dec 4, 2011
I have an InputBox where I want someone to input a number. The number would be an integer. The line looks like this amount1 = InputBox("how many?", "how many?")If they click cancel, it errors out because it can't convert blank ("") to an int. How can I do this with InputBox and not get that error?
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Mar 23, 2011
how to convert string to datetime and calculate date
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Jul 26, 2011
I am developing a site in ASP.Net and VB.Net that will enable users to sort data in a GridView in Ascending or Descending order.The records are coming from an SQL Server Express database.
I go to click on a column heading to sort the data and I get the following error:
'Conversion from string "DESC" to type 'Double' is not valid.'
Below is the code I am using for the sorting:
[Code]...
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Apr 5, 2011
I have a gridview and I'd like to summarise data in it and I found some code to help me do that on the following website: [URL]
The thing is, when I tried to convert and use it in my program, GridViewHelper just refused to be recognised
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Jan 29, 2011
I'm trying to add the date and time of Today into a Sql-database-field that has the datetype datetime.
[Code]...
the msgbox gives me the following result: 29/01/2011 18:49:21 my sqlException gives me the following error: 102 - Incorrect syntax near '18'. Is it better that i set the datatype to char in my sql database? It's maybe a bit easier? When I do that, can I calculate with these date?
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Nov 7, 2010
I've been all over the help files and finally patched together a VB OleDb connection string for delimited text files:
Dim connection As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=" & fName & ";" & "Extended Properties=""text;HDR=YES;FMT=Delimited"""
"fName" is passed in by an open file dialog.In every case (for all paths) it throws: 'C:1_2010NormalFileNormal.csv' (or where ever it is pointed) is not a valid path. Make sure that the path name is spelled correctly and that you are connected to the server on which the file resides.Since no path works, it must be a syntax error, but I'll be darned if I can see it.
Full code of this routine is:
Dim connection As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=" & fName & ";" & "Extended Properties=""text;HDR=YES;FMT=Delimited"""
Dim conn As New OleDbConnection(connection)
[code]....
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Sep 6, 2011
I'm new to this board and I was wondering if you guys could help me out. I have a problem that needs to be resolved before 9:30PM tonight.
I'm a bit of a sloppy coder so work with me. Here's the code that's giving me problems:
[Code]...
I have 6 text boxes, 5 of which accept input. When they're focused on they become blank for a number to be typed in and upon losing focus, they add the labels etc. on their own.
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Jul 12, 2010
I am getting the error: Conversion from string "11/07/2010 13:00:00" to type 'Date' is not valid. In my ASP.NET code when run on the web server. The date is valid and it can't be a US format issue because either way it would be valid. I have tested it and it seems to error when the time is > 12:00 (ie. a 24hour like 13:00 or 21:00).
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Feb 17, 2012
I am trying to write code to calculate 2011 Federal Income tax for single person. When I run the program, I get Conversion from string "" to type 'Double' is not valid.
Here is my Private Sub btnCompute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompute.Click
[Code]...
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Jun 17, 2011
I have a random generator with a textbox where the user selects the number of randoms they want from a text file that is loaded into a listbox. I want some code to prevent the user from trying to randomly generate more items than what they entered in the text file. I have a messagebox that informs them they entered a higher number than what is in the file, which appears to work until I hit the backspace key to change the number in the textbox. Then I get this error. "Conversion from string "" to type 'Integer' is not valid." I currently have the code in the textbox, text_changed event, not sure if this is the right place. Basically what I want to do is have the message box pop up to inform the user, then reset the textbox back to empty so the user can choose a new number. I already have a textbox keypress event to only accept numbers, no letters. Not sure if I can combine the code to do both.
Private Sub tbxRandom_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles tbxRandom.KeyPress
'only allows numbers to be entered into tbxrandom textbox
[code]....
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Mar 21, 2011
If it will found period in the email add it will say I am converting it to long.
Button
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]....
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May 1, 2012
I get the error: Conversion from type 'FileInfo' to type 'String' is not valid. This happens in between try and end try
Private Sub CopyNotes()
Dim NotesBase As String
Dim NotesTgt As String
[Code].....
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Aug 30, 2011
I have the following code to use Words spellcheck feature on a RTB. Once you pick the correct word in the spellcheck box and press change I get the error on th efollwoing line
strResult = Left(objDoc.Content, Len(objDoc.Content) - 1)
I tried to use CType() but still complains.
If (Len(t.Text) = 0) Then
'nahhhhhhhhhhh
Else
[Code]....
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Mar 15, 2009
We know that VB string start and end with double quotes " "
So we have to use "" if we want " in VB string.
I wonder if there is a regular expression pattern which will match VB string?.
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Jul 30, 2009
I have a Session variable in which i have stored one date '22/7/2009'.Now i want to convert value in session to datetime. I tried folowing code:
Session("AppointmentDate") = Request.QueryString("ADate")
Dim s as datetime=Convert.ToDateTime(Session("AppointmentDate"))
But error is showing as 'string is not recognized as a valid datetime'. convert value in Session to date?
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Jul 16, 2010
am making a project were the user can put a specific time in a textbox. the program needs to check the system time and the time in the textboxif they are the same there needs to start an action.
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