I'm using Streamwriter for the first time with my project which consists of 2 forms. When I run the program everything works fine until I press the SAVE button on the menu bar to save the data to a txt file. At this point I get the error "conversion from string to type single is not allowed." [code]
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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 RepliesI now have SQL Parameters set up and I'm using them to save/delete/add my data. This all works well, except when it's trying to save a combobox to the datatable it appears with the error above.Majority of my comboboxes have datasources, and the valuemembers of these are the actual list items, not the ID's of the list items.I'm not sure why this error could be happening, I'm fairly sure I've connected everything to the binding source correctly; I've checked it a few times.Does anybody know what the cause of this could be? I've looked around a bit and I haven't found much
View 7 RepliesI'm getting the error "Conversion from type 'DBNull' to type 'Date' is not valid."here's the line generating the error.
dtReady.Value = dSet.Tables("Db").Rows(Inc).Item("Fixed_Date")
I'm using a date/time picker control and sending the db value to it. I know that the value is null, but I don't understand why the Picker can't be blank. Is there a way to let it be blank? Or should I set up a way to check for nulls and assign today's date or something just in case?
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.
I am getting the error "Conversion from type 'DataGridViewTextBoxCell' to type 'String' is not valid." When trying to display a cell from DGV in a listbox.I have my variable for the cell reference as follows:
Dim a As Object
a = DataGridView1(4,1)
To insert it in the listbox as follows:
lstLetter.Items.Add(String.Format(a))
I tried:
lstLetter.Items.Add(a)
This will not actually display the entry inside the referenced cell, it shows this in my listbox instead:
DataGridView TextBoxCell { ColumnIndex=4, RowIndex=1 }
how I need to convert this to display.
I was tried to get quantity from db make use of the selection in list box. I got answered with listbox1. If i selected the item in listbox1 the quantity would appear in textbox1. But in this same code will not work for listbox2 with textbox4.. Here i given the code...
$Con.open()
$Dim cd as new oledb.oledbcommand("Select Quantity from tlist where tool_name"& "'"listbox2.selecteditem & "'" & "", con)
[Code]....
Here i got the error as "Conversion from type DBNull to type string is not valid"
I've been getting this error when pulling data from a recordset. It is coming from a null entry and as a newbie to VB2008 I'm not sure how to get around this.
here is my code lblShipping.Text = reader("CARRIERCODE")
the error:Conversion from type 'DBNull' to type 'String' is not valid. Basically what i'm attempting to accomplish is to see if there is anything in that field. If so put it into the text box if not leave it blank.
I am getting a conversion type error on the red line?
Private Function GetGap() As Integer
Dim VowelNumG As Integer
Dm Vowels as string = "AEIOU"
Dim VowelIndexG as integer
For VowelIndexG = RandomStr.Length - 1 To 0 Step -1
[Code] .....
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.
I designed a payroll application and I keep getting the error conversion from string to type Integer is not valid.Also when I enter the name in one of the textboxes it reads form and not my name.[code]
View 2 RepliesI 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
I want to connect to the proxy server using with the webbrowser while reads the strings of the proxy username, password, ip and the ports in each textbox.ere it is the
Imports System.Net
Imports System.IO
Public Class Form1
[code]....
there is one search button to see the report on datagridview using year..so when the more items are there in database correspond it year(say 2012)... the above exception is thrown by filling the datgridview,the problem happens when it tries to connect with crystal report,it shows error...Remember that i face this problem only if there are more records in my database(exactly more than 100 rows)...when i delete few rows from the database,it works fine..I have created a table and added that table to a dataset,then assigned that table1 as datasource for crystal report
[Code]...
there is one search button to see the report on datagridview using year..so when the more items are there in database correspond it year(say 2012)... the above exception is thrown by filling the datgridview,the problem happens when it tries to connect with crystal report,it shows error...Remember that i face this problem only if there are more records in my database(exactly more than 100 rows)...when i delete few rows from the database,it works fine..I have created a table and added that table to a dataset,then assigned that table1 as datasource for crystal report
Public Class crystalform1
Dim r As DataRow
Dim t As DataTable
[code]....
I have a sql select statement with something like:
select...
where column in (@Parameter)
In VB code a set parameter.defaultvalue to "65555,67803", But i get an error "Conversion failed when converting the nvarchar value '65555,67803' to data type int."
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."
View 3 Replies<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:1; mso-generic-font-family:roman; mso-font-format:other; mso-font-pitch:variable; mso-font-signature:0 0 0 0 0 0;} @font-face {font-family:Calibri; panose-1:2 15 5 2 2 2 4 3 2 4; mso-font-charset:0; mso-generic-font-family:swiss; mso-font-pitch:variable; mso-font-signature:-1610611985 1073750139 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-
[code]...
Error :Conversion from string "LastRunEnd" to type 'Date' is not valid.
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.
Why am I getting that error message? This is the code which it's happening to:
Public Class frmford
Dim LoanAmount, InitialPrice, Make, TradeIn, OriginationFee, DepositAmount, Model, Options, AirConditioningTax, GST, PST, Total, Subtotal, APR, Months, RoofRack, SunRoof, SideAirBags, TintedGlass, RearSpoiler, GPS, PowerLocks, FreightAndPDI,
[Code]....
I tried to Dim those variables as double and it didn't work either.
i want to save the settings of the checboxes so next startup it will take the settings how they were put in. But it gives an error when i am opening the "Settings tab" : Conversion from string "Settings" to type 'Boolean' is not valid.
Ill post my code here:
Private Sub Settings1234hide_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
CheckBox1.Checked = My.Settings.MyBool
[Code]......
When I open by form and close it when txtprojend.text is empty I receive unhandled exceptional error in the code below; How can ignore and never receive the exceptional unhandled problem. Conversion from string "" to type 'Date' is not valid.
Dim datProjEnd As Date = CDate(txtprojend.Text)
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]....
Basically I am trying to have it so when they click the save button it changes the timer.interval to what they entered in the textbox.On form load I have it do this.
Timer2.Interval = My.Settings.timer_interval
timertxt.Text = Timer2.Interval / 1000
When they click the save button.
My.Settings.timer_interval = timertxt.Text * 1000
Timer2.Interval = My.Settings.timer_interval
The program works, but it throws an error Conversion from string "" to type 'Integer' is not valid.I understand that the textbox is a string and the Timer Interval is a Integer, make it work without having to click continue after it throws the error.
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]....
The function below gives the error:Conversion from string "AMI" to type 'Date' is not valid.InvalidCastException was unhandled.
Public Shared Function LoadPatHist() As List(Of PatHist)
Dim PatHist As New List(Of PatHist)
Using conn As New System.Data.SqlClient.SqlConnection()
conn.ConnectionString = ConnectionString
[code]....
i'm getting error like this An error occurred creating the form. See Exception.InnerException for details. The error is: Conversion from string "" to type 'Boolean' is not valid.
my code was
If UsernameTextBox.Text = 1 And PasswordTextBox.Text = 1 Then
PIF.Show()
End If
mithila.s
Im geting a error:InvalidCastException was unhandled by user code Conversion from string "UNITID, INSTNM, ADDR, CITY, STAB" to type 'Integer' is not valid.
Dim
WFSDINSTITUTION As
String
=""
[code]....
I received this error when trying to launch a button. After entering a date of 01/02/2009 it returned this error: "Conversion from string "" to type 'Date' is not valid." My code is as follows:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Me.txtVerifiedInfo.Text = Request.Item("txtFirstName") & _
Chr(13) & Chr(10) & Request.Item("txtLastName") & _
[code]....
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
