Error On Calculation Of Double Type Input From MaskedTextbox In .net?
Jun 30, 2012
im calculating fare amount from 2 masktextbox mtxA and mtxB, i use the format 0000.00 ,, i was able to convert all prompt char values from mtxA and turned them into really zero but however it doesnt do the same on mtxb, though ive used similar code.. so my flow should be: whatever i values i put on mtxA.. on its textchange,its current value should be also put to mtxB plus an additional of 200.00
as an example : if i put on mtxA = 0030.00
mtxB = 0230.00 should be the display
but what is shows on me is mtxB = 2300.00 and also if i save it on the database .00 is not added,.....im tired fixing this so i try to use textbox instead of maskdtextbox, what i did is put lots of conditions and function on keypress to have the same format 0000.00 but i failed because everything on my code mess up whenever the user tried to edit the text according to textbox current position..check textbox.text current length from 0 to before the cursor location...but i dont know what code i should use to get the length..
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Jan 24, 2010
How do you validate input when you are dealing with doubles. I have successfully gotten the message box to pop up when the user enters a number in a text field, but what if I have a text box that requests a number from the user and they enter text? This is the code, the even for btnDisplayFull works fine, but not btnDisplayRqst: [code]
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Apr 12, 2011
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
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Dec 4, 2009
I have code that loops through a string array to add words one at a time to a line of limited length. I am trying to fit a phrase on up to four lines, centering the words on each line. My code appears to add the first word but on the 2nd word I get a "conversion from string "IS" to type 'Double' is not valid" error.
Here is my code so far:
varResult = Split(strPhrase)
intWordCnt = UBound(varResult) 'count words in phrase
'make words fit on one line
[Code]....
The phrase in strPhrase is "GOD IS LOVE"
I don't understand why I am getting this error when I didn't on the first loop through the code and it Put the word "GOD" into the line.
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Jul 3, 2011
I am going to make a form which will have 10 MaskedTextBoxes. I want to validate input of all these MaskedTextBoxes then Sum the input of validated one into another MaskedTextBox. If there is any value in any MaskedTextBox it mast be validate by the format of "9990.000" or if it is empty return zero. I do not want to write the same code for every MaskedTextBox, I want to use function & sub. The problem with "e" type TypeValidationEventArgs. When I call the SumBurBoxes sub in txtBur_1_TypeValidationCompleted & give the "e" as second parameter, then if the txtBur_1 be invalid type and any other txtBur Boxes have value it will get error on all boxes if the txtBur_1 be valid type even the the other boxes be invalid type it does not get error on them.
Here is my Code.
Public Class Entrance
Private Function RetrnTxtBur(ByVal index As Integer)
Dim txt(0 To 9) As MaskedTextBox
txt(0) = Me.txtBur_1
[code]....
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Feb 25, 2011
I have a maskedtextbox that i want to limit character input in it but i can't manage to figure it out.The date type is "yyyy-mm-dd" and the mask is "1300/00/00" (it is not gregorian calender, it is persian )In the TextChanged event i am changing the bindingsource filter.Because of this i don't want the user enters invalid date. For example the user enters 9 in here : "1300/90/00" i want to prevent this from happening before TextChanged event occur. (the place isn't important i just want to stop user from entering an invalid month or day)I have tried the KeyPress event but i don't know how to detect where in the textbox user is entering a character.
Note that i know already how to validate and i have a code for that but the TypeValidationCompleted event occur when user does all changes and leave the textbox.
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Jun 25, 2011
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
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Oct 18, 2010
how to get the mantissa and exponent from a double in VB.net? I know I can do a string parse and some conversion to ints but I wondered if anyone had a mathematical equivalent formula that would allow me to do this?
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Jan 25, 2012
i am making application and for the security pupose i setup a registration form and use the masked texbox to as the input of the serial till now this is my code
Private Sub Serial1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles Serial1.TextChanged
If Serial1.Text.Length = 4 Then
Serial2.Focus()[code]....
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Jul 28, 2009
I'm trying to do a calculation where-in the output is different depending on what the input is. [code] I have these repeated using >=50 >=60 etc. but when I go to run the program I get this: [code] basically I need to know how to create a cut off point for the grading system. <= doesnt seem to work.
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Aug 11, 2010
When i use VB6 i get the following outputs
961.605 * 100 = 96161
936.495 * 100 = 93650
929.295 * 100 = 92929
NOW..... When i do the above in vb.net 2005 i get the following
961.605 * 100 = 96160
936.495 * 100 = 93650
929.295 * 100 = 92930
How can i get the same output as the VB results. And i have tired it ! Type conversions, math functions, everything i can think of to get the same VB6 output !
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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]
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May 7, 2012
I am using two textBox's. The first to enter the data. The second to convert to answer the program complies with no error, the debugger cannot convert data type from string to double.
[Code]....
why does the program not convert the textbox txtFahrenheit from string to double?
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Jan 12, 2011
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.
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Jun 6, 2011
I have a few question Regarding VB.NET 1) I have a datgridview and i want when user input the datagrid 3rd cell the 4 cell of datagrid readonly = false means user not input value in 4th cell 2)i want a autonumber generate in textbox is alphanumeric like "vendor9" or " "vendor10" bt when i go to save this it give error of "double to type string is not valid" i have use a following coding
CODE:
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Nov 18, 2010
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
[code]....
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Oct 11, 2011
iam passing a textbox value(the value is 10:1:1) into a string and when iam running the application iam getting the following error "coversion from string "10:1:1" to double type is invalid". kindly find the code below and help me on the same: (also the textbox values should be greater than 0 always)
Dim strEncrypt As String = txtData.Text
If strEncrypt > 0 Then // I am getting the error here
txtEncryptedData.Text = Encrypt(strEncrypt)
Else
[code]....
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Sep 21, 2009
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
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Oct 22, 2011
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
[Code]...
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Oct 6, 2011
I have DataTable, and is bound to DataGridView. So, when the user inputs some values in 4 columns, it would calculate the sum and put it in the last 2nd last column.
Here's the code that I'm experimenting:
vb.net
Private Sub DataGridView1_RowLeave(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataGridView1.RowLeave
Dim i As Integer
Dim intTotal As Integer = 0
For i = 5 To DataGridView1.Columns.Count - 3
[Code]...
So, basically it should sum up certain columns when the user enters numbers into it and then display it in the last column.
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Jun 3, 2011
1st i get this error
query error and Conversion from string "Insert into Table1 (cust_id," to type 'Double' is not valid.
when inserting data to database 2nd error is
when use employee name to get employee id i got result always 0 here is the code
" select id from customers where name2='" & ComboBox1.Text & "'"
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Feb 21, 2010
error: Conversion from string "The world is veiled in darkness." to type 'Double' is not valid.
If Label1.Text = 8 Then
Label2.Visible = true
End If
im trying to make label1 .visible = true when label5.text = 8 i set the properties to label1.text to false so when the counter hits 8 it turns label1.visible = true
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Aug 11, 2010
When i use VB6 i get the following outputs
[Code]...
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Oct 22, 2009
I want to use explicit conversion (CType function in VB.NET) to convert the variable d from double type to integer type and store the result as 132.
Imports System.Console
Module Module1
Sub Main()
[CODE]...
This is my code. But Visual Basic tells me an error: Error1Type 'i' is not defined.C:\Users\mihaispr\Desktop\Conversie explicita\Conversie explicita\Module1.vb1922Conversie explicita
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Dec 2, 2011
I am working on a mortgage payment calculator that has three user input textboxes (amount, interest, term). The interest input is a MaskedTextBox masked to (00.0). The issue I have is that if the MaskedTextBox is has no user input when the calculate button is selected then I get the error "FormatException was not handled" "Input string was not in the correct format", I highlighted the section in the code below. I'm quite positive the error stems from the MasketTextBox mask of 00.0, the decimal I believe causes the issue when no other data is entered.
[Code]...
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Mar 30, 2011
For two days I have been looking for a way to enable button when MaskedTextBox is completed but no luck.The button does get enabled but not until you type(hit) a key after all characters(numbers) have been entered.To work around this, I adding two different events for the MaskedTextBox like the example below.
Private Sub MaskedTextBox1_TextChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles MaskedTextBox1.TextChanged
'If MaskedTextBox1.MaskCompleted Then
[code].....
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Apr 9, 2010
I updated an MS Access file with data and it showed the data is there. When I tried to retrieve I get this message " Conversion from type DBNULL to type Double is not valid" Below is the code to retrieve.
[Code]...
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Jul 15, 2010
I have the following code which is not working, giving an error Conversion from string "" to type 'Double' is not valid.What am trying to do is if the shown value on the combobox is empty then set the two textboxes to empty strings.
If cmbactiveproj.SelectedIndex = "" Then
txtclientOrgnw.Text = ""
txtProjectID.Text = ""
End If
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Jan 22, 2010
i am getting error like "Conversion from string "0/" to type 'Double' is not valid." in the underline part of the coding ..........
here iam using sqlserver-2005
here my coding is
Protected Sub save_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles save.Click
Dim conn As New SqlConnection(ConfigurationManager.ConnectionStrings("guest1").ConnectionString())
Dim booking_no As Double
Dim year As Double
[code]....
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Feb 19, 2012
The project I'm working on is a Multichoice RadioButton quiz with answers and percentintegers. At the end there is a MsgBox that gives the number of answers counted 'correct'and the percent 'correct'. Also after you press the confirm button on that MsgBox it emails the results to the built in information given on the SMTP information. What I am trying to do now is show the input typed into the textbox on FormA in the MsgBox at the very end.
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