Unable To Convert The DataType?
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
[code]....
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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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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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Aug 26, 2011
i want to convert old vb6 project to Vb.Net 2008. I converted everything except 'ANY' datatype.
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Oct 4, 2011
My 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?
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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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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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Oct 21, 2010
i keep getting the error unable to convert chartype to date time or Error incorrect syntax near 14.[code]Please any help on inserting a string into a datetime field in SQL Server.
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Aug 12, 2009
While I am running the following code
If rdrOnClick.Item("DOB") <> "" Then
dtpDOB.Value = rdrOnClick.Item("DOB"
End If
the error occur
Unable to convert MySQL date/time value to System.DateTime
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Mar 29, 2012
I have developed a vb.net application, which searches for different kinds of dates from a document. When i test the app on my Windows 7, VS2010 PC, the dd/mm/YYYY date read as string is correctly converted to valid date format, and then it can perform followingfunctiontstimespan =Date.Now.Subtract(Convert.ToDateTime(DesiredMatch.Value)).DurationIt works fine on development PC. But when i test the application on my client PC having Windows XP, it throws an error 'string was not detrmined as valid date time windows'.
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Apr 9, 2009
I am writing a library in VB.NET in which I have added, among others, a class originally written in C# but converted into VB.NET. I don't know much about C# so therefore I have used online C# to VB.NET-converters. Now I am stuck with some code which I believe the online-converter was not able to "translate" properly.
When running the code I get the following error:
System.IndexOutOfRangeException was unhandled
Message="IndexOutOfRangeException"
StackTrace:
at System.String.get_Chars()
[Code]...
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Dec 26, 2011
I need to display on my datagridview the data from MYSQL db, but I'm having a problem on a field which is in DATE format in mysql
cmd.CommandText = "SELECT * FROM tbl_user_log"
cmd.Connection = sqlcon
dr = cmd.ExecuteReader
[code].....
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Jul 13, 2006
I'm using Visual Studio 2005 Team System For Software Developers. When I try to add a new DataSet to any kind of project, I cannot get to the visual DataSet designer. Rather, I get the following error (all the time no matter what the type project actually is - Windows app, Web site, etc.): The custom tool 'MSDataSetGenerator' failed. Unable to convert input xml file content to a DataSet. Data at the root level is invalid. Line 1, position 1.
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May 9, 2012
I am been stuck on this for 3 days now...I have been accessing the twitter api to pull a user_timeline for a list of users and the json that comes back is impossible to work with. I tried to deserialize it using javascriptserializer and get an error:invalid object passed in , ':' or '}'
Now this is frustrating since I expect the json being returned to be error free. Then I tried json.net and split the posts using string.split and tried to convert each post to Jobject or jarray. for Jarray I get
'unexpected end of content while loading jArray
[Code]...
Now I have formatted the code here and not pasted the whole file but it does look like valid json to me and I do not alter anything after receiving the stream from the twitter api. Can someone please point me in the right direction? I really need to get this stuff parsed?
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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 31, 2009
I have got a MySQL database that has got some dates stored in a Date format (YYYY-MM-DD) however when i try and import the data i get an error saying: "Unable to convert MySQL date/time value to System.DateTime"
[Code]...
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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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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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