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].....
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].....
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].............
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)
I don't know if my SQL statement is wrong or what but basically I'm trying to select a record where a date column in SQL matches the value selected by the user in a date and time picker control. The format in SQL is IE: '2010-03-23 00:00:00:000'. The date and time picker shows me 'March-23-10'. How can I get it to match up with the way SQL holds it's dates and return a matching record? Is there some intellisense that pops up that
View 3 Repliesi m using mdb file i need to get Date from DateTime field and i have to group by the Date?
View 11 RepliesI 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
Assuming that i picked a day from a Calendar component on VS 2008, how may i add a specific number of days to the date? (i've to store the final date in datetime datatype to DB after which) Parsing involved possibly?
View 1 RepliesI 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
View 4 Replies(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
[code]....
i want to convert old vb6 project to Vb.Net 2008. I converted everything except 'ANY' datatype.
View 6 RepliesMy application pulls data from a one column MS Access table. The column name is "Timer", and in Access the values are stored as text. In my application the DataTable stores the values as Timespan. Since the strings are of the format "01:22:15", there is no problem parsing the strings to Timespan when filling the DataTable When I am done working with the data, I want to update the Access DB, so I call dtAdapter.Adapter.Update(dt). This is when I run into trouble. As the application tries to update the database, I receive these errors:
"A system.InvalidCastException was thrown: Object must implement IConvertible""Failed to convert Parameter value from a Timespan to a String"
How do I instruct the TableAdapter to convert my Timespan values in the "Timer" column to strings before storing it in the database?
I am trying to store a time from my textbox field value but I got this exception error,Failed to convert parameter value from a TimeSpan to a DateTime.[code]
View 1 Replieshow can i use value (23,32) in sql column datatype int how can i use comma in column data type int
View 8 RepliesI'v designed a ms access database table with one field having Datetime datatype. I can Insert data into it from vb.net front end by trns_dt DateTime.Now.DateBut when I fetch records from the tableand assign the dataset datasource as da, it shows datatype mismatch error.
daleDbDataAdapter("SelectDaily_Transactiondtp_from_dt.value dtp_To.value con)
dsDataSet
[code].....
I don;t know what datatype while storing the data of datetimepicker in vb.net. The tools i use is sql server.
View 1 RepliesI'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
View 1 RepliesI 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]...
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.
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"...
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?
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.
This is just a quick question: Are there any difference between
[Code]...
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?
as the title states. Is there a way to determine if both datatypes are the same?
View 2 RepliesJust 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 ?
is there a datatype available in visual basic that can be used to store dates?
View 4 RepliesI'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]...
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.
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.
View 4 Replies
