Using Datatype Object And Determine Datatype In Class Property - Several Integers Columns That Are Null In The Db?

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 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
Return _custID[code].............


Using Class As Datatype In Property?

Dec 17, 2010

I am getting error in the line


It is probably that I havenot created an instance of class, MyPoint.

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim MySrs As New MySeries(20)
MySrs(1).A = 10


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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 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

Dim myCommand As SqlCommand
myCommand = New SqlCommand("select * from [HMS].[dbo].[DoctorSchedule] where DoctorID='" & txtDoctorID.Text & "'", Connection)


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Sep 21, 2011

i have been redirected from the technet forum to use 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"
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 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, i don not know. I am not a developer but i have good understanding in writing code and using

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Changing DataType To An SQL Or Database Datatype?

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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Change DataType Of Datatable Columns?

Sep 7, 2011

I want to change the DataType of all columns of DataTable. I don't want use the loop.. [URL]

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Jul 9, 2010

I have a datatable which has a number of rows containing dataThen I need to add some empty datacolumns which I do like this:

Dim OT_Hours As New DataColumn("OT_Hours")
OT_Hours.DataType = System.Type.GetType("System.Double")


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Aug 12, 2011

Following is the code which gets xml data from web service and then dataset reads using ReadXml method. This Xml has ID and MyDate tags for each table row (so table(0) will have ID and MyDate columns) and this Xml data does not have schema associated with it. When page is loaded first time, it sorts by ID in asc order. It was working until ID was 999. When next ID came as 1000, even in ID asc, 1000 is showing before 999 in datagrid.

I wanted to confirm that when dataset is loaded using ReadXml, all the columns in its table are treated as string even they are numbers or dates and that's why in ID asc order 1000 is coming before 999.

Also, MyDate tag has date in format "01/31/2011" (mm/dd/yyyy) and it seems that sorting is wroking fine for date. Would sorting by date always work even when dataset table MyDate column is of type string (assuming that my above statement is correct)? Are my two above assumptions correct?

stream = New System.IO.StringReader(XML data returned from web service)
With dataset
dvView = .Tables(0).DefaultView


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Feb 9, 2009

I'd want a text box that at design time the developer can set a datatype property so only a value matching that datatype can be entered at runtime (e.g. If we made the datatype property of a textbox an integer then the user could only enter numbers into that textbox)In additiion I need a further property to replace ".Text". .Text always holds the entered value as a string, I want the new property to contain what has been written into the textbox but as the datatype that has been selected at design time.

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Usercontrol's Property - Property That Has A PictureBox Datatype

Feb 9, 2011

I have made a usercontrol, it has a property that has a PictureBox datatype. When the usercontrol is dropped on a Form from the toolbox, I want the picturebox property (in the property window) to be showing all the picture boxes (names) that are on the form as a dropdown so I cant select them. How do I do that?

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VS 2005 Check Object DataType?

Oct 14, 2009

Is there any way that I can use to check the datatype of an object??What I want to check is like below (yes, below will not work. Its just a scratch logic).

example:If TypeOf(objPasser) = Integer Then


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Dec 4, 2009

Is there a way to change a base class type by Overrides or Shadows, or other meen?[code]...

In this example there is MyBaseClasswitch is the base Class, then ClassB that Inherits from MyBaseClass, and In ClassB I try to overrides the base property "MyColl" to change is type to a enum.

But it do not work, telling me that the base collection cannot convert to eCarBrand, blah blah blah

Is there other way to change base class type or other approach that a could use?

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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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Jan 27, 2011

I have a class and method exposed to a client app. The class looks like

<DataContract()> _
Public Class Class1
Private v_string As String
Private v_integer As Integer


The method is declared as

<OperationContract()> _
Function GetStuff(ByVal bar As Class1) As String

In the client code I create an instance of Class1 and set the values for v_string and v_integer, but using Wireshark to look at the xml being sent to the server only a value for v_string is being sent as part of Class1. I'm guessing this is because it considers the value of v_integer to be null/not set. Here is an example of the client code.

Dim MyService as New Service1.ServiceClient
Dim test as New Service1.Class1
test.P_integer = 1


how different types are passed/used since Integer is a intergral type and String is a class, but can't seem to work out what to do to fix the problem.

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Sep 27, 2009

I don;t know what datatype while storing the data of datetimepicker in 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 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")


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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:


Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
Response.ContentType = "text/plain" '//#### <- should't this be text/json? ###


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
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End Function

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Dec 13, 2011

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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

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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
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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;


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Equivalent Of The SQL Server Bit Datatype?

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:


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Oct 29, 2009

I would like to retrieve the datatype of a specific element from a SQL table. The situation is that I am importing data from a source that does not match column-to-column with my SQL table. The objective is to compare the datatype from my source file to what it MUST be when I write it to my SQL table, and throw an error on a mismatch. I would like to do this without creating a class that contains the layout of my target table if possible.

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Aug 7, 2011

I have two function having same name only datatype changed in parameter

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SaveData(Byval p as string)

By the definition of polymorphism this should work.It does not show any compile time error but when I run the application and call the function it does not recognize it. And gives the error Function SaveData is not defined.But when I put a break point on the function it works fine.


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Sep 8, 2009

I am trying to define a function that I would like to specify a datatype as in input of the function. The only/best way I evision doing this is by making a enum with the range of datatypes the function will accept and us the enum as part of the function's signature.


Enum MyDataTypesString


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Jul 16, 2010

(VSE 2010, .NET 4.0)I am attempting to fill a DataTable with columns of numbers from a CSV to create lines on a third party chart control called Zedgraph. The problem is, the control keeps plotting one-to-one lines of point counts (in other words, if the column has 400 points, it plots a straight line from 0,0 to 400,400). I believe it is doing this because the data in my table is still being input as type String, which it shouldn't given the Cdbl(Var(x)) function I have written in. Why do you think my table values are still of type String?

Imports ZedGraph
Public Class Form1
Private Sub CreateDataset(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim DataSet As New DataSet


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Aug 26, 2011

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Nov 8, 2011

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Aug 11, 2011

I have written XML file having a Date <Date>10/11/2011</Date> tag in it as above and trying to read it from VB.NET:

If TypeOf item Is DateTime Then
nextItem = DirectCast(item, DateTime).ToString("MMM-d-yyyy hh:mm:ss.fff", ci)
End If

How to get the date tag in XML in datetime format in the application? (As I am getting the date value as string in the application)

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Jul 29, 2010

Question: In order to store logos in a database and display them dynamically in ms-reporting service, I need to base64 encode the image. It doesn't work with binary saved images, due to MS limitations...

Now my question: Which datatype do I use? Varchar, nvarchar or text? I guess varchar would be good enough, since base64 encoded, but images might be larger than 4000 characters...

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