Forms :: Threads 'Conversion From String To Type 'Double' Is Not Valid'
Mar 30, 2011
I have a application that writes and reads from a serial port.The com-port is opened elsewhere in the early stages of starting / running frm_Main and is not shown. I have a button1 on my form and when I click it, the module 'RTUValues_Get_IOData' executes perfectly ok, with no errors.[code]However when I call it via a thread [button2], I get the following exception error and it hangs, at the part shown above in RED"Conversion from string "" to type 'Double' is not valid."
I wanna perform a function like this. When you save a record, I need the primary key of that record to be auto-generated (X001). Say, when you create a new record and save it, it should be saved like X002 automatically.So to test this before I implement that on this project I'm working on, I created this little program.form.png
All its supposed to do is, when you click on the OK button it shows a code that is fetched from a database table. (X001). Then when you click on it ober and over again. The number should increase. X002, X003, X004... so on.Here's my code
Imports System.Data.SqlClient Public Class Form1 Private Sub btnOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnOK.Click[code]....
But when I run it, it throws this conversion error.exception error.png.I know its pretty straight forward so I tried to correct it with what I know
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]
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]
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".
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.
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.
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] ......
[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]
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]
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.'
I make a query in coding. But I got conversion error.My query is below
Dim strSelect As String = "" strSelect = "SELECT " & _ "Description As [Desc], " & _
[code].....
Exception error is like
Conversion from string "iif(CurCons = 0, " to type 'Double' is not valid
Actually, in my report, i wanna show if it's zero then '-'. If i set it in this string.I got another error like below The provider could not determine the Decimal value. For example, the row was just created, the default for the Decimal column was not available, and the consumer had not yet set a new Decimal value.
From da.Fill Dim cmd As New OleDbCommand(strDynamic, m_DBConn) Dim da As New OleDbDataAdapter(cmd) da.Fill(ds, "tblCur")
I've been just making random programs trying to get the hang of the new language this time I was making a leap frog game where it switches back and forth beetween frogs every time a button is pressed. It also checks if the frog can land in the text box above the button pressed, if there is another frog there a message box will pop up saying sorry space is filled other wise the frog should land there.
[code]...
The error message says "Conversion from string "frog1" to type 'Double' is not valid." I understand what a double is but I've tried And If and that causes a bunch of errors.My Question is whats wrong with this cod and how can I make a double if statement???PS I did try to make an array to shorten this but thats in a different fourm will post URL later
I created an application in vb.net 2005. It works fine on my machine. I tested several different test machines and all were working fine. As for the client, it's generating an error. My application reads from an excel sheet and imports the values to an oracle database. the error being generated is: "conversion from type string to type double is not valid". Why is it generating only on the client's computer and not mine?
I'm doing some error debugging trying to get the errors on our website down to a minimum and there seems to be an error that is popping up quite a lot Conversion from string "" to type 'Double' is not valid.
I'm unable to replicate this problem but I can see that it is happening.I've been looking through the code in one of the pages and strolled across this
Dim varWeek As String If varWeek < 10 Then 'Do something' End If
Could this be causing the problem as it is trying to see if a String is less than 10 which is an Integer?As I said before as I am unable to see this error in the first place so changing this to an Integer doesn't change anything on my system.
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.
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.'
well i made the program to generate a random number from 0 to 100 andi want that if the number is more than 50 then it show picturebox1 but it seems not working it give methis error "Conversion from string "label1" to type 'double' is not valid
I have a bad bug in my program where if a user presses the check(calculate) button when there is no input in the textbox the program displays this error: "Conversion from string "" to type 'Double' is not valid." I would like to resolve this but I am not sure how to do the conversion. I was thinking possibly CType but I am hearing talk of parsing. How do I go about this? the textbox is called mskTxtInput and the button object is called btnCheck which does all the calculation and processing.
Private Sub btnCheck_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCheck.Click pic1.Visible = False 'hide picture pic1.Image = My.Resources.A
I am getting an error: Conversion from string "" to type 'Double' is not valid.If any of my textboxes are blank even though I have used an if AndAlso statement.
Private Sub tbWidth_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles tbWidth.TextChanged Dim wMath = tbWidth.Text / Form1.tslblWidth.Text Dim hMath = Form1.tslblHeight.Text * wMath If Form1.tslblWidth.Text IsNot Nothing AndAlso tbWidth.Text IsNot Nothing Then tbHeight.Text = hMath End If End Sub
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.
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
Using VB.Net If the grid cell value is empty, i am getting error as "Conversion from string "" to type 'Double' is not valid"Code (gridview_CellLeave)
Dim z1, z2, z3, z4 As Int32 If grvList.CurrentRow.Cells(1).Value <> "" Then z1 = grvList.CurrentRow.Cells(1).Value End If If grvList.CurrentRow.Cells(2).Value <> "" Then
