Determine Whether A Conversion Is Valid Before Attempting To Perform It
Aug 25, 2011
I have the following subroutine:
[Code]...
The intention is that an event handler is set for any control added to the form, but only if it's a certain kind of control — determined by what its most-derived type is. Putting overarching design concerns aside for the time being, although this subroutine functions properly, when running the debugger the constant exceptions keep leaving messages in my "Immediate Window". It's annoying, and presumably throwing exceptions only to immediately re-catch them is wasteful.
View 3 Replies
ADVERTISEMENT
Apr 8, 2009
a user will enter a number, n, which ranges from 1 to 30. they will also enter a "P" or an "S" (sum or product). depending on which was selected, it will calculate the sum or product of the numbers from 1 to n.i'm having a conversion error on line 5 stating "Conversion from string "S" to type 'Double' is not valid." [code]
View 2 Replies
Apr 19, 2010
I am having problem with the coding of this (endless loop) and formatting of summary boxes before tests are complete that should not happen. (the overall goals is to have a separate validation procedure that does not calculate or dat displays are not performed until after call function is complete and valid. The validation that takes place are that two boxes are filled in - one is text and the other is a numeric value. (using vb 2008)
[Code]...
View 10 Replies
Mar 4, 2010
i have a program that you enter a code and your selection goes ito a richtextbox and is then added up in another as you select more items, i have run into a problem it worked a few days ago but now will not.
Dim dectotal As Decimal
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]....
View 2 Replies
Jan 21, 2011
I get the correct numbers out of the variable(in this case 11) but i cannot compare it bcuz i get this error. both values are int, cannot seem to find the problem.
Dim id = CInt(Request.QueryString("id"))
Dim uk = From hj In dc.Orders _
Where hj.UserID = id _
Select hj
View 1 Replies
Aug 2, 2010
I have a string in the format of 20100730 which i need to convert to UK format of 30/07/2010.
When i try to set 20100730 as a date it says it is not valid. Is there another way i can do this?
View 4 Replies
Dec 10, 2009
I have a form to calculate charges based on input data and charges stored in an array. When I try to save an entry to a file my program crashes and I get the error "Conversion from string "" to type 'Double' is not valid.
If rdoDay.Checked = True Then
Quote.DrivingHrs = txtDrivingHours.Text
Quote.WaitingCount = txtWaiting.Text
[Code].....
The error highlights the last line of the if statement beginning "Quote.TripCost" as the error, but I don't understand why..
View 10 Replies
Mar 19, 2010
Heres my code:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim product As String
[Code]....
Its says conversion from String to Integer not valid for this line: sales = InputBox("Please Enter Your Product Sales: ")
Also, when the first messagebox comes, how can I make it when you select "cancel", the programme then exits the sub routine and a second messagebox dosent come up?
View 13 Replies
Feb 24, 2009
I am new to VB I get this error message "Conversion from string "" to type 'Double' is not valid. when running my app, (the underline codes are the errors), which is a basketball simulator. How can I correct this:
Private Sub playButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)
Handle playButton.Click
Dim rank As Integer
Dim player As Integer
Dim shoots As Integer
Dim RandomGenerator As New Random
[Code] .....
View 3 Replies
Feb 28, 2012
i have a text box and i want to insert the textbox value to my sql procedure in server and then generate record in the datagrid view ... the parameter in sql server i declare as varchar and actua database column item datatype is nchar.. anyway in what suitable datatype that i have to put in my visual basic for the textbox in order to transfer the vlaue to sql procedure and generate result
View 7 Replies
Mar 4, 2009
I have this program i have to do for my Intro class. The assignment is to have the user enter a pay code(A,B or C) and the amount of hours worked. If the hours is more than 40hrs, they will receive time 1/2. And it must also calculate a 22% Tax.I was getting this error: Conversion from string to type 'double' is not valid. But some how i eliminated it.[code]
View 1 Replies
Nov 21, 2007
I have the following IF Statement checking if the function GetNexstAddress (which gets the ClientID from GetClientFleetInfo(i).CLIENTID) . SECONDARYCITY
is there.
If GetNextAddress(GetClientFleetInfo(i).CLIENTID).SECONDARYCITY(0) = Nothing Then
NextAddress = " No next Destination"
Else
[Code].....
View 15 Replies
Oct 24, 2011
The error occurs on the line If wba.Selected = "MARKETING CODE" Then.
[Code]...
View 1 Replies
Oct 16, 2011
i always got error every time i run this program . here's the code.
'declaring variables
Const DEPOSIT As Double = 30
Dim dbltotal As Double
[Code]....
View 2 Replies
Feb 8, 2010
I am trying to update MS-Access database where one field is boolean and updating a string. I am getting a error message "Conversion from string "Update Claims set appointed=" to type double is not valid".
View 1 Replies
Mar 11, 2009
I'm getting this run time error using VB 2008 Express:
"Conversion from string "" to type 'Double' is not valid."
Below is my coding
If cmbxitem.Text = "Brownish" Then
TextBox2.Text = 37
ElseIf cmbxitem.Text = "White Feathers" Then
TextBox2.Text = 30
'ElseIf cmbxitem.Text = "B/Wchicken" Then
'TextBox2.Text = 15
[Code] .....
View 7 Replies
Apr 27, 2010
Imports System.Math
Public
Class Form1
'Declaration
Public
NotInheritable
Class Convert
[Code] .....
View 14 Replies
Oct 20, 2011
I have the below code in my app... Nothing is declared as a integer so I dont understand or see where the problem could be... It is saying:
Conversion from string "9838 Co Rd 47" to type 'Integer' is not valid.
The address is flowing through the entire function as a string the only place I think it could be getting changed somehow is in a function call... Below is the function that throws the exception. Followed by the function that returns the address.[code]...
View 2 Replies
Dec 2, 2009
I am currently making a project for school and this project is to determent the poker hand, where the user can only check 5 check box and each checkbox represent a card , and when I try to test it and check the box it would let me and this message popped up:
Conversion from string "" to type 'Integer' is not valid.
And the arrow point to this line of code
i = CInt(Mid(strChk, 1, 2))
View 12 Replies
Jun 21, 2010
I have the following code:
tb_Job_No.Text is a combobox
This is the code:
Public Sub RepCD_process()
ssql_Job = "SELECT * FROM Rep_Dist"
ssql_Job = ssql_Job + " WHERE (Job_Number = '" & tb_Job_No.Text & "') "
Dim Main_Form As New Main_Form
[Code] .....
Can't seem to get pasted this, when it is remark out all works. How to correct this and get data into the listview?
View 1 Replies
Feb 16, 2008
Populating a datatable from Access gives me this exception where a record has an empty field. How do I handle it?
System.InvalidCastException was unhandled
Message="Conversion from type 'DBNull' to type 'String' is not valid."
Code:
Private Sub ShowData()
lblCustNo.Text = CStr(dtOrderEntry.Rows(intCurrRow)("CustNo"))
lblCustName.Text = CStr(dtOrderEntry.Rows(intCurrRow)("CustName"))
lblAddr1.Text = CStr(dtOrderEntry.Rows(intCurrRow)("Addr1"))
lblAddr2.Text = CStr(dtOrderEntry.Rows(intCurrRow)("Addr2"))
[Code] .....
View 5 Replies
Dec 13, 2009
Public Class Form1
Private Sub RealTime_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RealTime.Tick
Real_Sec.Text = DateAndTime.Now.Second
End Sub
Private Sub Real_Sec_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Real_Sec.TextChanged
Sim_Sec.Text = Sim_Sec.Text + 1
If Sim_Sec.Text > 59 Then
Sim_Sec.Text = 0
End If
End Sub
End Class
When the timer is on, it will tell the current seconds in real time, and when the text in the textbox for the Real_Sec changes, it will increment the text or the value in the Simulated seconds... FROM 0... No matter where the seconds are in the real seconds, it will display real or simulated seconds in the sim_sec text box... Starting from 0... But there Real Seconds, because the Timer is not accurate. So I Simulate the Real Seconds. How to write it the right way, it's keeps throwing the error:
An error occurred creating the form. See Exception.InnerException for details. The error is: Conversion from string "" to type 'Double' is not valid.
View 3 Replies
Nov 30, 2011
I have an unbound datagrid of which I load a csv into it.I then add an additional column and populare it with row numbers:
Private Function AutoNumberedTable(ByVal SourceTable As DataTable) As DataTable
Dim ResultTable As New DataTable()
Dim AutoNumberColumn As New DataColumn()
[code]....
I then add to my datagrid :
datagrid1.DataSource = AutoNumberedTable(ds.Tables(strFileName))
I then try to update my sql table:
My insert paramater:
insertCONTACTS.Parameters.Add("@Company_ID", SqlDbType.Int, "Company_ID")
My add row:
row("Company_ID") = datagrid1.Rows(r).Cells("Company_ID").Value
But I get the above error, I thought when i added the column, the values in the rows were integer.How can I convert my column to integer.
View 13 Replies
Oct 2, 2011
I am doing a project entitled "Automation of Student admission process".I am having a datafield UGPercent of datatype(18,3) NULL in my database.When i tried to insert it using the following code Insert into Markdetail(UGPercent)values(" & txtperc2.Text & ")..It shows me the error:conversion from string to double is not valid.what is wrong in my code?
here: Markdetail is my table
txtperc2.Text-The textbox used to get the UG percentage.
View 2 Replies
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)
View 2 Replies
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]
View 8 Replies
Aug 13, 2009
while am executing the following code cmdSSN1.CommandText = "SELECT * FROM Patients WHERE SSN='" & Trim(txtSSN.Text) & "' AND id " <> EditPatientId
it shows 'Conversion from string "SELECT * FROM Patients WHERE SSN" to type 'Double' is not valid.
View 6 Replies
Oct 2, 2009
I have a dataset containing a datatable, and I enumerate all rows in that datatable. When trying to format a column in that row, I run into an exception. (Part of) the code is:
For Each dr As DataRow In ds.Tables("records").Rows
file = dr("timestamp").ToString("yyyyMMdd") & "~.wav"
Next
This results in the following error message:
Conversion from string yyyyMMdd to type Integer is not valid. (translated from a Dutch error message to the English equivalent)
dr("timestamp").GetType.FullName results in "System.DateTime", so I don't understand why I run into this exception, as for example Now.ToString("yyyyMMdd") results in "20091002", and "Now" is of the same type as dr("timestamp"), "System.DateTime" that is.
View 2 Replies
Jan 28, 2010
Please excuse the newbie question as I started learning VB last week . I wrote the following test code below to add two values entered in two textboxes and display it in another textbox. However I keep getting the exception. "Conversion from string "" to type 'Decimal' is not valid" with the code below and I cannot figure out why . I thought converting using 'CDec' resolves this issue ?
View 3 Replies
Nov 2, 2010
I keep getting this error "InvalidCastException: Conversion from string to type 'Double' is not valid." whenever I try and run this piece of code. Could someone explain to me where it is trying to make a conversion to double? No matter what I do to my input string, I get the error.Here is the stack trace:
Input string was not in a correct format.Description:An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.FormatException: Input string was not in a correct format.
[code]...
View 7 Replies
