VS 2008 String Not Recognized As A Valid Datetime?
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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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 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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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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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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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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Mar 23, 2011
how to convert string to datetime and calculate date
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Dec 1, 2011
I am importing a .txt file to a gatagridview and writing out a Schema.ini fileMy columns that contains a date value is empty in my DGV when i use the:DateTime in my .ini fileIf I set it to Char then my date is populatedDoes this mean my dates in the text file are not really dates but strings ??
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Feb 10, 2011
when saving the "conversion failed when converting datetime from character string" is displayed.
Private Sub BtnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnSave.Click
Try
Dim cn As New SqlConnection(ConnectionString)
cn.Open()
[code]....
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Aug 20, 2010
I get this error:
"Conversion from string "7F676981" to type 'Long' is not valid."
When using this
Reader.Position = &HD044
TextBox2.Text = Reader.ReadHexString(4)
TextBox2.Text = CLng(TextBox2.Text)
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Dec 10, 2009
i've done a search on this error n found no match so i decided to create a new thread.this part of the program is suppose to get the date interval of dd(due date) and dr(date return) n charge the members accordingly.the program opens normally but when i go thru the records i have in my database, conversion from string "" to 'date' is not valid pops up.[code]
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Jul 29, 2010
I am working on a program that has a combobox that gives you selections for email address endings, but when I try to enter it in as part of the final email address get an error. Here is my
mail.To.Add(TextBox1.Text(ComboBox1.Text))
When I click debug, it give me this error. "Conversion from string "@txt.att.net" to type 'Integer' is not valid."
"@txt.att.net" is the value of the combobox selection.
In the end it should be something like: "anything@txt.att.net"
(Textbox1.text = "Anything" & the current ComboBox1.text selection = "@txt.att.net")
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Mar 4, 2010
I'm trying to delete the 2 last characters of a string if they are "||". This is my
Dim MyReader As Microsoft.VisualBasic.FileIO.TextFieldParser
MyReader = My.Computer.FileSystem.OpenTextFieldParser(playlist)
Dim TextFields As String() = MyReader.ReadFields()
Dim last As String = TextFields.Last
If last.Substring(last - 2) = "||" Then
last.Remove(last - 2)
End If
But it gave me the following error on the highlighted line:
"The converting from the string to the type Double is not valid."
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Aug 13, 2010
I am trying to populate a textbox.text with a value with a record from a datagrid. I can get my value from the datagrid by the following
Dim eRow As Integer
eRow = datagrid.CurrentRow.Index
txtSelecteditem.Text = datagrid.Item(0, eRow).Value
This all works fin when there is a value in the cell it is picking up. However, I hit a problem when this filed is blank.
The error I get is: Conversion from type 'DBNull' to type 'String' is not valid.
How can I get the textbox to populate with null if the field is null.
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Sep 13, 2010
I want to to make date format dd/mm/yyyy with access 2003
Dim strdate As string="22/09/2010"
Dim dd1 As New Date
dd1= strdate
I get : Conversion from string "22/09/2010" to type 'Date' is not valid.
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Jan 27, 2010
i have a problem with my code: [code] At the bold part, when i goto debug my program i get the error "Conversion from string "TrueFalse" to type 'Boolean' is not valid."
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Dec 28, 2009
After successfully running an executable file several days ago, I am suddenly encountering a number of inexplicable errors. One concerns the lack of recognition of two libraries:
microsoft.office.core
microsoft.office.interop.excel
How could they previously be found but not now?I am using another workstation but loaded (so I thought) the same application and references.
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Aug 17, 2010
I have the following code.
Imports System
Imports System.IO
Public Class frmUpdater
When I try to run this I get the following error: The volume does not contain a recognized file system. Please make sure that all required file system drivers are loaded and that the volume is not corrupted.I am trying to read all drives with FAT16, FAT32 and NTFS.My PC is using NTFS and is running normally.
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Jun 15, 2009
how can I solve this error without having to fill all of my fields. Some of the fields in my database are Nulls and some have records.
Error: Conversion from type 'DBNull' to type 'String' is not valid.
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Apr 14, 2010
See the end of this message for details on invoking just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.InvalidCastException: Conversion from string "" to type 'Boolean' is not valid. ---> System.FormatException: Input string was not in a correct format.
at Microsoft.VisualBasic.CompilerServices.Conversions.ParseDouble(String Value, NumberFormatInfo NumberFormat)
[Code]....
When JIT debugging is enabled, any unhandled exception will be sent to the JIT debugger registered on the computer rather than be handled by this dialog box.
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May 14, 2010
I developed a VB.NET application in visual studio 2008. I am beginning to test it on user's machines. For many users, it works just fine. For some users they get an exception error:
System.InvalidCastException: Conversion from string "0" to type 'Double' is not valid. ---> System.FormatException: Input string was not in a correct format.
I developed the application with Option Strict ON. The line of code causing this issue is below:
Dim x as double
x=cdbl(y) 'where y = "0"
Another error the same problem-users are seeing is: System.FormatException: Input string was not in a correct format.
The line of code causing this error is
Dim x as double
Dim tempStr as string
x = Convert.ToDouble(tempStr) 'where tempStr="0"
The interesting thing here is that it works fine on my computer and fine on several test-users' computers. I compared the .NET framework between a working user and a non-working user and it was exactly the same. It seems to be getting hung up on string issues.
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Jun 3, 2009
im in the mists of making a hangman game and i almost done and i just stumbled upon a error here is all the code
Public Module Module1
Public letter1 As String
Public letter2 As String
[Code].....
i get the error in the title on the bold underlined text after i input a letter thats not in the word
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Jan 23, 2010
Here's the API
BOOL InternetSetOptionA(
__in HINTERNET hInternet,
__in DWORD dwOption,
__in LPVOID lpBuffer,
__in DWORD dwBufferLength
);
I have the first 2 parameters correctly, here's what I have:
Const INTERNET_OPTION_PROXY_USERNAME As Integer = 43
Const INTERNET_OPTION_PROXY_PASSWORD As Integer = 44
Const uname = "bproxies"
Const pass = "qwert1"
[code]...
And here's the error: Conversion from string "bproxies" to type 'Long' is not valid.
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Jul 9, 2009
We get this error: Conversion from type 'InternalField' to type 'String' is not valid. When we get to this in our Dim fname2 = fname args.Graphics.DrawString(fname2, New Font("arial", 8), Brushes.Black, 5, 5) fname is a nvarchar variable from a recordset. It's just a name.
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Jan 20, 2010
I use following codes to retrieve data from table, but get error Conversion from type 'DBNull' to type 'String' is not valid.
str = "Select * from gpass where vou_no= " & Val(Me.txtGat.Text) & " And Date = '" & Me.txtDat.Text & "'"
dt = GetTable(str)
If (dt.Rows.Count > 0) Then
[code]....
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