Determine The Correct Datatype?
Sep 21, 2011
i have been redirected from the vb.net technet forum to use asp.net forums instead.
I am using some COM components within an asp-page or vbscript. As an example the code flows like this in vbscript:
set objectA=CreateObject("SomeComponent.A")
objectA.PropertyA="Some String"
objectA.PropertyB=ValueA
set objectB=CreateObject("SomeComponent.B")
set ObjectC=ObjectB.MethodA ObjectA
This code works fine and i can continue with the data in ObjectC.
Now i want to change this into ASP.Net with VB. If i open the COM type libraries in Oleview32, the datatype expected in MethodA is VARIANT. So i tried to pass into a type of Object in MethodA. This leads to an exception and code stops.
Is there a way to determin or to trace what vbscript is passing into MethodA so that i can get an idea of how to prepare the datatype i have to pass into the method-call? Are there any tools for that? So ctypeing to an object does not do the trick. A better documentation about the COM Object is not available.
The first reply from the vb.net guys was´, if the COM libraries can be hosted on iis? So, they are used excessively within asp pages on iis 7.5, if they can be used in asp.net, i don not know. I am not a developer but i have good understanding in writing code and using asp.net.
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Mar 8, 2010
anything wrong with using datatype object and determine datatype in class property? I have a typed dataset and it has several integers columns that are null in the db. and when I make a call it throws exception.is there anythign wrong with setting it as object in my dataset.. changing the throw exception property to Nothing and passing it to my property as integer?
for each row in myDS.DataTable
cRate.CustID = row.CustID
next row
and in my class
Public Property CustID() As Integer
Get
Return _custID[code].............
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Mar 27, 2012
I have this code that use to sort a datatable.
Dim sortingIndex As Integer = orderby
Dim DataTableNew As DataTable = New DataTable
DataTableNew = dt.Clone
Dim query = (From c In dt.AsEnumerable Order By c.Field(Of String)(sortingIndex) Ascending)
query.CopyToDataTable(DataTableNew, LoadOption.OverwriteChanges)
My problem is that with this method I always need (Of String) for it to work, so the date columns are also managed as Strings witch is the problem. Is there a way to use the correct type so the sorting is based on the type of the column?
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May 3, 2009
I have a form that allows users to enter information into a few textboxes. When users click save, the information will be transferred into the datagridview.
My problem now is, for instance, there is a textbox called "Price" with the datatype "money" which users are only allowed to enter numbers. If users enter alphabets, errors will occur. I don't wanna use try catch, I would like to try different methods such stopping users from entering anything into the textbox when the datatype isn't correct - nothing will appear in the textbox when users hit all the keys in the keyboard except for numbers.
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Feb 27, 2009
ASPX:
<a
href="ShowImageVB.aspx?id=<%# Eval("ProdID") %>">
<asp:Image
runat="server"
ID="ImageThumbnail"
AlternateText="Click here to open the real size image"
ImageUrl='<%# "ShowImageVB.aspx?thumbnail=true&ID="& Eval("ProdID").toString%>'
Style="border-width:
0px;"
/>
</a>
Code Behind:
Dim data As DataView = SqlDataSource1.[Select](New DataSourceSelectArguments())
The above code does not seems to work when I change my ProductID to UniqueIdentifier Datatype. This is the error I have ""Input string was not in a correct format."
But when change the ProductID to Int datatype is working fine.
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Apr 30, 2002
I'm using a 3rd party chart COM object (National Instruments CW graph) to plot data versus elapsed time.The x value needs to be a VB6 equivalent Date type which is a .NET DateTime datatype.What I need is a way to convert a TimeSpan datatype to a DateTime datatype.
Dim testTime as System.DateTime 'date
Dim plotTime as System.DateTime 'date
Dim elapsedTime as System.TimeSpan[code].....
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Jan 15, 2012
I have a database in mysql. The column in table is of datatype time(0)
Similarly I have a control datetimepicker in vb.net I have assigned format property as custom to the control and the CustomFormat property as HH:mm:ss tt so that it can just provide the time. I dont want the date to be in it.
Issue comes when I try to retrieve the value from database I get an error as Converion of type 'Timespan' to type 'Date' is not valid
Try
Dim myCommand As SqlCommand
myCommand = New SqlCommand("select * from [HMS].[dbo].[DoctorSchedule] where DoctorID='" & txtDoctorID.Text & "'", Connection)
[Code].....
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Jan 2, 2011
I am working on a produce inventory database in my VB Express program.I have a form on the bottom and a spreadsheet at the top. I want to enter all the data in the form and have that data automatically transferred as a group to the spreadshet in the upper part of the page when I press a button.I know that there's an insert function.I set it up correctly. The problem is that I have to convert the textbox, which contain string data, to the datatype used in the database spreadsheet.HOw do I use CAST or do this?Here's the function I am using:
Me.TableAdapterManager.InventoryTableAdapter.Insert(IDTextBox.Text, fruitName, unitprice, unitsize, unitIn, unitTransit, unitOut)
Evernything is a string cause the data is coming from a textbox, I need to convert it to the datatypes used in the database.Also how do I use the CAST and Convert functions
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May 14, 2009
I am receiving this error message: "Input string was not in a correct format." on my ASP.net 2.0 VB project.
When looking at other posts with this error its obvious that each time it will be specific to the users' project. Therefore my main question is, is it possible to generate a more informative error message?
I am already in debug mode but it does not tell me in which string the problem lies. I am converting some strings to integers with "Cint" and have also tried the Integer.Parse() method to no avail.
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May 15, 2010
Is it correct to correct properties values on the fly? for example: (note the .ToLower)
Public Property X() As String
Get
Return _x.ToLower
End Get
[code]....
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Jun 8, 2010
i'm working on a system that upgrades a basic version to a proversion but i have a payment gateway . it generates a code in an SQL DB.now i have a form in VB that has a textbox and a button how can i let VB connect to my SQL DB receive the code and then check if that code is correct and if its correct download silence the pro file. from an url.
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Apr 18, 2009
I have created a basic query generator which allows a user to select the Select, WHERE and criteria attributes using a number of checkboxes.However i have got stuck. In the results form i have the following code
Private Sub DisplayRecord()
RichTextBox1.Text = ds.Tables("newResults").Rows(intCurrentRecord).Item(0)
RichTextBox2.Text = ds.Tables("newResults").Rows(intCurrentRecord).Item(1)
RichTextBox3.Text = ds.Tables("newResults").Rows(intCurrentRecord).Item(2)
[code]....
The program keeps on crashing if the user does not select the corresponding amount of display records from above for the amount of attributes they want for the SELECT part of the query in the intreface in form 1.
How would i go about making something where the number of SELECT attributes selected which are listed in a string create the correct number of textbox fields in the results form (form2)
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Mar 27, 2011
how can i use value (23,32) in sql column datatype int how can i use comma in column data type int
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Sep 27, 2009
I don;t know what datatype while storing the data of datetimepicker in vb.net. The tools i use is sql server.
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Feb 2, 2011
I'm using SQL Server 2008 and Visual Studio 2008 with .NET Framework 3.5. I'm teaching myself and this my first time posting a question here. And I was wondering if someone could clarify something for me.I've created a table called Classes. One of the columns is called Enrolled and is of data type tinyint (0 to 255) since the class will never have more than 50 students enrolled.In my application I created an object called ClassInfo and declared a private variable ..private _classAmt as byteMy question is this..What if someone wants a total of students enrolled for that year? Do I need to convert to a larger data type such as int32 or would it be better to set the data type as Integer in t
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Jun 20, 2012
I have a window application created in VB.net 2005 and the backend is sql. I make a call to the database and it returns a datatable. When I loop through it, I get a value of -1 for my field "Rush" which is a bit datatype. when I pass the sql into the analyzer, I see the value should be a 1 so not sure why it's giving me a -1. Here's some of the code that's in the page: Dim tblSendEmail As DataTable
tblSendEmail = oService.GetSendEmailInfo 'Goes to a webservice and returns a record set in the datatable
For Each row As DataRow In tblSendEmail.Rows
iRush = row("rush")
next
[Code]...
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Sep 15, 2011
I have the following line of code:
CType(IIf(CBool(product.IsDiscontinued Is Nothing Or product.IsDiscontinued = True), False, True), Boolean?)
What does the Boolean? mean at the end. I have seen it used on other data types as well.
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May 16, 2011
I have the following script which works, but I don't understand why it will not work when the type is set to json:
Serverside:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Response.Clear()
Response.ContentType = "text/plain" '//#### <- should't this be text/json? ###
[Code]....
When I change those values to json, the whole thing stops working and returns "null"...
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Nov 8, 2010
I am converting the database in an application in Visual Basic 2008 from Access 2000 to SQL Server express 2009 R2 database. There are several fields that "SmallMoney" seems the mos appropriate to use. When I try to use the "SmallMoney" datatype in a Parameter, it won't accept it, the datatypes listed when I try to indicate the datatype does not inclue Mone or SmallMoney. It does include "Currency".
However the ere doesn't seem to be a "Currency" data type in Visual Basic. Would I be better of using Double and change the table definitions back to Double as they were in Access?
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Feb 15, 2011
Just come across the following snippet:
Public Function Checked() As Boolean
Return applyChange 'this is a string!
End Function
Whats going on here? How can a function with return type Boolean actually return a string? I'm assuming theres some implicit conversion going on here, which I'd rather not have.
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Dec 13, 2011
This is just a quick question: Are there any difference between
[Code]...
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Jan 5, 2009
I have a datatable that I read xml into.
One of the columns is a date, but the dataype of that column is set to string. Is it possible to change that dataype to date?
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Jun 21, 2010
as the title states. Is there a way to determine if both datatypes are the same?
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Jul 25, 2010
I have a boolean check property of my check boxes in VB.NET. how can I send that value to SQL server having a bit data type
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Mar 30, 2010
Just got an overflow issued and found that it was about the datatype. I fixed it and test it around
Change the datatype of Int32 to
1. UInt32 - 32bit
2. Double - 64bit
It works fine in my side. UInt32 Length should be long enough for me. I am thinking to use UInt32 as it "saves" more disk space (or probably runs a bit faster). However, what is the drawback if I always use Double ?
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May 1, 2009
is there a datatype available in visual basic that can be used to store dates?
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Oct 20, 2010
I'm using two DateTimePickers to represent 'StartDate' & 'EndDate'. On initialization I set the StartDate control to today's date at 12:00 AM. I do that like this;
[Code]...
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Nov 26, 2009
I have a field in a SQL Server table that is of type bit.When I try to use a Boolean in VB.NET when passing parameters to a stored procedure, there are never any matches. I have also tried passing an integer to the stored procedure and that does not work either.
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Dec 22, 2011
Function returning different datatype
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Mar 19, 2011
I have a dropdown box which is used to select a user from a database. I am then populating a number of textboxses with the user information from the database. I want to populate a dropdown box (which holds the users role) dependant on which user is selected from the first drop down box.
Here is my code:
[code]...
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