String Default Parameter Value After Conversion
Mar 9, 2012
We have a legacy component that has been converted from VB6 to VB.Net.The VB component was called from an ASPX page using Request("param") to pass optional parameters to function calls. That means the value is null/nothing if the parameter is not present.The parameters were then added to an ADODB call of a store procedure using Parameters.Append.When used from VB6 missing, Request("param") values were coerced into empty strings when passed to the VB6 component. This meant that the ADODB call was satisfied (for required parameters).When the code was ported to VB.Net, the null Request("param") values are now passed as null values (VB nothing?) and Parameters.Append skips adding the value if it is nothing. This caused the stored procedure calls to break as a required param was missing.
If we change the component's function parameters to be optional and have paramname as string = "" defaults, will a null/nothing value be converted to an empty string, or is null/nothing treated differently to a parameter being simply missing?
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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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Mar 19, 2012
I did create a XDateTime class that is able to handle inaccurate date and time. This class has all the CType operators required to convert to and from a string and it has been fully tested during the last months.
[Code]...
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Jul 21, 2011
I have 2 methods with the same name, with diferente signatures.
Public Sub Method1(ByVal Parameter1 as String, ByVal Parameter2 as Boolean)
Public Sub Method1(ByVal Parameter1 as Integer, Optional ByVal Parameter2 as Boolean = False, Optional ByVal Parameter3 as Boolean = False)
If I call Method1("My String Parameter", False) it will not give and error, it will try to convert the parameter to integer and use the overload.
Is there a way to forbid the implicit conversion in this specific method or in this specific parameter. For instance, I changed the second method name, but its not an elegant solution.
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Dec 9, 2010
its just like that in other langauges (php in the example)
function myFunction($message,$sender="nodoby") {
return $message." by ".$sender;
}
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Mar 30, 2011
im using data bound item with my combobox and this error pop up.
Parameter @UserType has no default value.
when i set the value,it stated that
"The changes you requested to the table were not successful because they would create duplicate values in the index, primary key, or relationship. Change the data in the field or fields that contain duplicate data, remove the index, or redefine the index to permit duplicate entries and try again."
should i edit my usertype column in my database or there have another solution?
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May 6, 2008
I am working on a very simple application in Visual Basic 2008 Express.
The program has a Listview where I display the "DisplayName" field, the user clicks on a name and this should fill 3 text boxes. The code is:
strSQL = "SELECT FName, LName, DisplayName FROM tStaff WHERE DisplayName=@DisplayName;"
Dim conn As New OleDbConnection(strConnString)
[Code]....
This produces the error "Parameter @DisplayName" has no defaul value"
The value of the variable "strDisplayName" is correctly captured.
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Apr 12, 2011
I want to include an optional parameter in a function statement that is of the type Unit. For example:
Public Shared Function NewTable(Optional ByVal TableWidth As Unit) As Table
Optional parameters require a default value, but I cannot figure out how to set a default value for a Unit type.
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Jul 28, 2010
I have a problem during defining a Sub routine in VB.Net. I am defining a sub routine which is as under
Private Sub ActivateControls(rdbutton as RadioButton, Optional txt as Textbox, Optional txt2 as Textbox)
End sub
When I call this sub routine It gives me the Error that Each Optional Parameter must specify a default value. So, Here I can't understand that what can be the default value of a textbox. What default value I can use here to remove this error.
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Sep 22, 2010
I think this is a pretty basic question, but I just want to clarify. If I have a variable with a null value, and pass it as a parameter that is optional, will the parameter get the null value, or the default value?
dim str As String = "foo"
dim obj As Object
//call 1
[code].....
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Jan 30, 2010
I am trying to do an insert into a table called Policy. I keep getting an error that says parameter @Split has no default value. To try and resolve the problem, I set the default value of the split field (of type text) in the Policy table to "0" in Access 2007. I am passing in the value of a string "0" into the parameter before the insert statement executes.
Dim connection As OleDbConnection = PaulMeadeInsuranceDB.GetConnection
Dim insertcommand2 As New OleDbCommand(insertStatement2, connection)
connection.Open()
[Code].....
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Nov 29, 2011
Argument not specified for parameter 'index' of 'public readonly default property chars(index as integer)as char'. Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code]...
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Sep 18, 2009
My problem is this (apologies if this is a little long ... hang in there):I can define a function in VB.NET with optional parameters that wraps a SQL procedure:
Sub Test(OptionalByVal Arg1 As Integer _
Optional ByVal Arg2 As Integer _
Optional ByVal Arg3 As Integer
[code].....
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Dec 27, 2009
This is driving me mad! This is my code and I have attached my parameters below with my error. What on earth is wrong.
[Code]...
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Jul 27, 2010
Access 2007 and Stored Procedure. I keep getting this error: Parameter [@MyNumber] has no default value.
[Code]...
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Apr 8, 2011
I'm trying to code a program but this error repeatedly shows up and I can't for the life of me figure it out EValue of type 'String' cannot be converted to 'System.Windows.Forms.TextBox'. It appears in relation to this code
[Code]...
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Aug 18, 2011
I have buttons generated through code (dynamically). I have to associate an event (the same) to them. I use AddHandler button.click, AddressOf mysub.The issue is that mysub gets a string (mysub(string)), but AddressOf doesn't accept a parameter inside the routine. How can I do this? Using also an alternative to AddressOf.
EDIT:
Public Class Form1
...
Private Sub mysub(ByVal sender As Object, ByVal e As System.EventArgs, ByVal str As String)[code]......
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Nov 26, 2010
i am creating a currency converter in VB 2008. I have a two buttons to choose the currency � or $. When one is clicked the String � or $ is entered into my textbox. I need a backspace button. and i used this code.
tb_result.Text = tb_result.Text.Substring(0, tb_result.Text.Length - 1)
tb_result.text = my textbox.
It deletes the last string, but i want it to not delete the Currency($�).
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Feb 14, 2012
I'm having some difficulty with some code to update an Access DB. I keep getting "Parameter @ParamName has no default value" Renaming the parameter in both the SQL statement and the parameter.add, moves the error to a different parameter but it never goes away.
[Code]....
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Dec 4, 2011
I am trying to code a program that inserts records into a database. I am reading the data values from a text file, storing them as variables, and then ATTEMPTING to insert them into a table. However, I keep getting the following error: Parameter vSales has no default value.
Here is my code
Private Sub ImportButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ImportButton.Click
Dim DataConnect As New
[Code].....
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Jul 4, 2011
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")
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Apr 5, 2010
I have a button that is supposed to display the next row in my database, however Im getting the error "Parameter @ID has no default value"I can make my code work without parameterized queries but Im trying to make it work with them...So Im sure there is something wrong with my code, obviously
Private Sub btnNext_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnNext.Click
txtID.Text = txtID.Text + 1
Dim ds As New DataSet()[code].....
If I change my sql statement to
WHERE ID = "& txtID.Text &"
Then i can get it to work fine, but I hear that isn't good programming.
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Jun 14, 2012
Dim PrinterIP as String
Dim Str as String
Dim objReg As New IWshRuntimeLibrary.WshShell
[Code]....
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Jan 30, 2010
where i put the *'s i get the error "The parameter 'address' cannot be an empty string. Parameter name: address".
Private Sub Timer2_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer2.Tick
Dim mail As New MailMessage()
Dim SmtpServer As New SmtpClient
[code].....
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Feb 23, 2011
I am not the one who developed this tool, it's the previous programmer and they gave the project to me to update it however, when I try to run the application in my local computer I am getting this error: Argument not specified for parameter 'XLSFile' of 'Public Sub New(XMLFile As String, XLSFile As String)'.
The error points to the code below in bold letter:
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
Zym.ConnectionString = Web.Configuration.WebConfigurationManager.ConnectionStrings("cnworkload").ConnectionString
'Dim cn As System.Data.SqlClient.SqlConnection = New System.Data.SqlClient.SqlConnection(Zym.ConnectionString)
'Dim DA As New System.Data.SqlClient.SqlDataAdapter("SELECT * FROM SUMMARY_WORKLOAD", cn)
[code].....
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Nov 15, 2010
How can I Convert a Unicode value to its equivalent string for example i have "రమెశ్" and i need a function that accepts this unicode value and returns a string I was looking at the System.Text.Encoding.Convert() function but that does not take in a Unicode value, it takes 2 encodings and a byte array. I bascially have a byte array that I need to save in a string field and then come back later and convert the string first back to a byte array. So i use ByteConverter.GetString(byteArray) to save the byte array to a string but can't get it back to a byte array.
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Nov 28, 2011
I need to convert this string to the proper form in my vb,net code
if (c == '"') {
s.Append('"');
} else if (c == '\') {
s.Append('\');
} else if (c == '/') {
[Code]...
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Oct 20, 2011
I'm reading Lat + Lng coordinates form my database. I need to convert them to double. This is what happens:
Dim strLat As Double = CDbl(reader.Item("lat").ToString) MsgBox(strLat.ToString) ' << result: 5237861 should be: 52.37861. The point is removed.
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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]....
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Nov 8, 2009
I get an InvalidCastException was unhandled on converting the .value to .text but I can't figure out how to convert it. Tried a few different ways but nothing seems to work. load a file from disk and have that be assigned to the trackbar.value?
Dim FileName = (App_Path() & "SettingsPingTimeout.txt")
If File.Exists(FileName) Then
lblPingTimeout.Text = "Ping Timeout: " &
[Code]....
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