Typed DataSet - InvalidCastException
Sep 12, 2011
I've got a typed dataset. I bind the data with a binding source to a form with arround 200 textboxes, dataedits and so on. Everything works fine with one exception:In my database I have empty DateTimes (DBNull.Value). And when they get bound to a DateEdit-Control, I get the following exceptions:
A first chance exception of type 'System.InvalidCastException' occurred in Microsoft.VisualBasic.dll
A first chance exception of type 'System.Data.StrongTypingException' occurred in myTestDLL.dll
I tried to change the NullValue-Property in the DataSet-Desinger to something else as 'Throw Exception', but it doesn't work for a DateTime. For other types like Integer or String it works fine.I dont know a nice solution (right now I fill the empty dates with some dummy date and make it invisible in the DateEdit-Control, but this is very uncool) and I hope to find some help here.
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Aug 9, 2009
I create one typed dataset by dataset designer in VS2008. How can I change this dataset to shared typed dataset?
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Mar 15, 2010
When the user clicks an "Edit" button on my form, I want a box to come up which allows the user to edit a DataTable in a strongly-typed DataSet. What's the best way to do this?
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Nov 25, 2009
I want to access data using both the datasets.
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Try
[Code]....
In my code i have dataset name ds and table named Info1,when i write ds after that how tablename is coming,its not possible? How to do that ?
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May 4, 2012
Private Sub frmbranch_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
Try str = "select * from EnquiryEntry Where EnquiryId=" & EnquiryId & ""
[code]......
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Jun 25, 2010
I created a dataset in Visual Studio 2010 containing two tables: tblCategories and tblAnswers. tblCategories has two columns: CategoryNumber (AutoNumber and primary key) and CategoryName. tblAnswers has three columns: AnswerNumber (AutoNumber and primary key), Answer, and CategoryNumber. The CategoryNumber columns in each table are related. I have a command button which I want to use to add a record to the CategoryName column in tblCategories with the data typed in a textbox. When I try to access the dataset to add a new row(dataset.tblCategoriesDataTable.NewRow), the NewRow method isn't present. I've done some reading which suggests that I need a TableAdapter, but it seems like that is for connecting to an external file because I have to select a connection. I have no external SQL files or database. I want the user to be able to create a database within my program.
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May 25, 2010
How do i use a while loop and MID$ function instead of the split function?i'm trying to have the input (textbox) compared to a list(array) in a text document?
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Apr 20, 2009
Firstly here's the code and i will explain my problem underneath. [code...]
Now as you can see I have a variable that holds a value member of the combo box Products which is the productID of the current product selected. Then it searchers through the products datatable and once its found the correct product or not it stores the answer in slectedproductrow. next I test to see if selected product row has found the product if it has i then see if the product has already been added to the order by seraching the the customer current order datatable if it hasn't it adds the current information to the order by using selected product row.
Now the problem i get is when i add the same product it still adds the information again as currentorderrow comes back as nothing everytime even if the product has been added before but if it was in the table which it should be it should skip that bit and just go to add the current qtys toghther.Also if i go to add a diffrent product it overwrites the the other one. So i can't store the customer order. Its like i can't store more than one row. By the way I have a datagrid and can see the product get over wrriten.
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Mar 16, 2010
I am using Dataset created by the wizard with BindingSource and Binding Navigator
For example, I placed a Textbox on the form, and bind it to a field.
I was trying to compare the field value stored in the sql server database with the data I have on my form.
Let say I run the form, and Textbox1 get it is value from the first row in mytable from BindingSource (let say value 1000) [code]...
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Apr 21, 2010
I have some VB.net code that inserts data into my SQL database using a typed dataset as follows:
dim usersTa As New authorizedUsersTableAdapters.Authorized_UsersTableAdapter
usersTa.Connection = New Data.SqlClient.SqlConnection(MY_CONNECTION_STRING)
usersTa.Insert(first_name, last_name)
[code]......
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Jul 21, 2011
I am trying to add a record to a typed dataset using example code provided on msdn. Currently using VS 2010 Ultimate (Trial until box arrives) Visual Basic Windows Forms Project. Unfortunately I am having a bit of trouble.[code]....
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Nov 30, 2011
Currently I am working on a project developed using VB.Net in Visual Studio 2010.Previously they were using Sql queries directly into SqlCommand of System.Data.SqlClient, but then after i shifted everything to Strongly Typed DataSet and started using TableAdapters every where..Now i just wanna ask that is this way is good for a project...Or Should i shift back to old ones using Just SqlCommands
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Jun 14, 2010
I am trying to sqlbulkcopy. I have a dataset defined (.xsd). It seems that I cannot use it with sqlbulkcopy. All the information I can find on sqlbulkcopy shows that it can only take a connection string or a variable that contains the connection string.
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May 15, 2009
I am deleting a row from a row that is currently selected on a datagridview.I am using a Typed dataset and my datagridview is bounded to a binding source.However, I think my technique is not the best, even though it works.
Dim drDelete() As DataRow
' Get the value of the PK from the currently selected row
Dim drv As DataRowView = CType(bsAddressBook.Current, DataRowView)
[code]....
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Dec 10, 2011
I want to bind a column of a strongly typed dataset to a combobox. But the problem is i have to get only the distinct values from the column and also when a user inserts a value into that column the new value should be showned in the combobox at the same time.And also i want to make the first row of the combobox to be unselectable..[code]how to make this column distinct values
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Apr 12, 2012
For some reason I'm unable to set the commandtext of the tableadapter. I have the following code:
'Prepare the sqlcommand
Dim dd As System.Data.SqlClient.SqlCommand
dd = new System.Data.SqlClient.SqlCommand
dd.CommandText = SqlUsers
[Code]...
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Apr 7, 2012
I cannot figure out for the life of me why I cannot reference a dataset table using the strongly typed name. I created a "news" table in a dataset to write out and read in a simple xml.
If you look at the code below this does not work: 'Dim TableFail As ADataSet.NewsDataTable = ds.NewsDataTable 'Does not work
I can access the table by using an untyped name however: Dim NewsTable As ADataSet.NewsDataTable = ds.Tables("News") What is the proper way of accessing the datasets 'typed' datatables name.
[Code]...
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Feb 10, 2010
How do I close a connection of strongly typed dataset? I want to backup my database with a zip technique. But I can't access it when my program is open. I've closed connections of all table adapters but it didn't work.
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Dec 30, 2009
I created a typed dataset and my database guys are constantly updating and adding columns to tables.. is there a way to do a comparison
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Aug 6, 2009
I create one column which is tinyint then I go to VS2008 and create typed dataset by wizard. Then I check that column's datatype it is now byte datatype. MS SQL 2005 tinyint = VS2008 byte ?
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Dec 22, 2011
I have found why this error in occurring but don't know the fix.
I am using Strongly Typed Dataset for my project which is created as a dll for DAL(Data Access Layer)
I have added the Sql Server Table into this dataset using the designer and has created a DataAdapter[code]...
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Mar 22, 2010
I recently updated an app that I wrote to allow the clients to run the app in read only mode disconnected from the database by serializing the typed dataset, and when they are offsite/offline instead of connecting to the database the serialized dataset is loaded. This has been working great and then I hit a major snag.
A majority of the graphs and reports are based on sql views that are typed views in the dataset. Of course offlline the tableadapters cannot run the sql views.
Does anyone know a way to run/fill the view with the already loaded dataset? I can add rows clientside so I'm inclined to believe there must be some way to fill the view clientside but I've been at this for a number of hours now and not making any real progress.
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Aug 12, 2011
What is the simplest/cleanest/easiest/best way to handle Null value of a Strongly Typed DataSet in the following case :A base class has a Nullable value that is set through it's constructorThe derived class's constructor has Strongly Typed DataSet Row as parameter and it Throw exception when accessing a null value.Here a simplified example to demonstrate the problem I'm facing. Any resemblance to your code is purely coincidental.
Public MustInherit Class BaseClass
Private _Number as Nullable(of integer)
Public Sub New(Number as Nullable(of integer))
[code]....
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Jul 27, 2010
I don't have the same problem when using an untyped dataset.
OK. I have a typed dataset MyDS with a typed datatable MyTable (TableID, Title, Message).
The table gets filled with results from two tables, using a UNION ALL
Select
TableAID,
TableATitle,
[Code]....
Is this how typed datasets handles UNION? I didn't want to create two typed datatables and create separate SQL for each and create a relation.
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Jun 1, 2009
I am working on a project, and have defined a strongly typed dataset. Normally I create a single instance of a dataset and use through out an application. In this case I have need to clone the dataset, and clear 2 of the table and then fill those 2 tables with fake data for creating a sample report. at the end of the retuine, I dispose of the dataset. So I was think all was good.
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Nov 19, 2008
I have a typed dataset with table adapters. I use this method because it makes it easier to design the layout of my DataGridView.The problem is I have added a new table to my dataset. When I go to the "Data Sources" list view, I can see the new table.However, if I add a new DataGridView to my form then attempt to bind it to my new data table, the table will not show up in the list of tables for that dataset.
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Jul 31, 2009
I have 2 table in my dataset i want to add both table column names to the combobox.. how can I add the other table to the datacolumncollection?
'gets column names from typed datset and uses as combobox in datagridview
Dim columns As DataColumnCollection = DataSet1.Tables(1).Columns
Dim column As DataColumn
[code]....
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Apr 29, 2010
I have a SQL Server database for which I have created a strongly-typed DataSet (using the DataSet Designer in Visual Studio 2008), so all the adapters and select commands and whatnot were created for me by the wizard.
It's a small database with largely static data, so I would like to pull the contents of this DB in its entirety into my application at startup, and then grab individual pieces of data as needed using LINQ. Rather than hard-code each adapter Fill call, I would like to see if there is a way to automate this (possibly via Reflection). [code]...
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Aug 30, 2011
I have a vb.net 2010 windows forms application with a strongly typed dataset. I am storing the database connection path in a txt file so that the database's location may be changed in the future for whatever reason. The typical location of the connection is the read only app.config from what I gather. I have the datasets modifier set as public but I am having trouble finding how to access the connection object for the adapter.
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Oct 6, 2008
I'm sorry but Microsoft did not think about this very well. I have used the dataset wizard to connect to my sql server and the connection string was placed in the app.config file. The only problem with this is that you can not write to it nor change string at runtime. So I need a way for each one of my users to specify their connection either during installation or after installation. I would appreciate any help in this matter.
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