C# - How To Handle Exceptions With A SqlDataSource
Apr 1, 2009
I have a SqlDataSource that is supplying data to my GridView. Thats all i am using on my form, thus i have NO code behind at all. But somewhere i need a TRY CATCH block just in case my connection get's lost. What code must i place where?
If i get a error i want my lblMessage Text to be "No connection".
Edit
My GridView in my Machine.aspx
<asp:GridView ID="GridView1" runat="server" AllowPaging="True" AutoGenerateColumns="False"
Height="209px" PageSize="7" Width="331px" AllowSorting="True"
[Code].....
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Apr 2, 2009
I was reading a couple of articles a while back which I think described a behaviour where you can, in a .net application (specifically VB.net), allow an exception to occur, and then handle it in some kind of application-level exception handler, as opposed to within a Try/Catch block. My google-fu is weak at the moment, so I'm not having much luck guessing what this feature is called in order to find information about it.
[Code]...
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Aug 20, 2011
I am working on a .Net Remoting project. If there is any exception in remote object, I would like to send this exception in detail to the client. I am using the following code to accomplish that-
'This is on a shared .dll
Public Interface ICreateNewMouza
[code].....
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Jan 22, 2009
An application raises the UnhandledException event when it encounters an unhandled exception.
For instance, you can use this event to ask user send you a report by email.
[code...]
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Dec 28, 2009
Is it possible to handle exceptions on the AppDomain.CurrentDomain.UnhandledException callback? I want to do the following:Show my own "an exception hasoccured" dialog, with a "Send Report"button After the user dismissed thebox, I want to close my app, but I donot want to Windows default crash dialog "Theapplication needs to close" box toshow up.
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Feb 26, 2012
I created a custom collection class with some methods: each of these has some parameters and throws an exception if a parameter is not valid.For example, the Add and Remove methods throw an NullReferenceException if one of their parameters is null.[code]...The Replace method replaces an item in the collection with another specified object: to reach the goal, it first calls the Remove method and after the Add method. Obviously the Replace method could throw exceptions if at least one of the specified parameters is null, because Remove and Add methods could throw exceptions.Is this the right way to go? Or should I also check the parameters in the Replace method as in the following code? [code]...In fact, in this second case, each check would be executed twice: first in the Replace method and after in the Remove and Addmethods, which are called by Replace, and in other cases the checks may be rather expensive.
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Apr 11, 2012
Is there a way I can catch and handle two different exceptions within the same exception type? For example:
Try
' My code
Catch ex As System.Net.WebException
End Try
I have 2 different exceptions that are System.Net.WebException. I want to handle them different ways. Problem is the catch block above catches them both. Is there a way I can determine if which of the two it is and handle them differently?
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Dec 27, 2011
I have a relatively simple VB.NET app. It targets framework 2.0 from Visual Studio 2010. The app works fine most of the time, except that the users sometimes receive the
following exceptions. The error is completely random and somewhat rare. I haven't been able to trap it while in a development environment. It also doesn't appear to be
pointing at my code. My app continues to run if the users ignore the error. How would I trap and handle this error?
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Jan 31, 2012
I wonder how to use statement handles exceptions?Do I need to wrap the using statements with a Try/Cath/Finally clause in order to be sure that the SqlConnection object is closed and disposed even if the containing code throws an exception? [code]
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Dec 26, 2009
I've just skipped around a few inbuilt VB classes' methods which throws exception. of all that i've came across, methods may throw multiple exceptions but ALL of them are exclusive, meaning there is no way 2 exceptions will ever occur simultaneously, yea and i was trying to make my class throw 2 exceptions simultaneously, hence this question, must all exceptions be exclusive?
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Oct 16, 2009
How to retrieve Dataset if there is sqldatasource control in the aspx page?
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Nov 15, 2011
I am retrieving the scope_identity of a db entry, and I want to use that variable in a different SqlDataSource, primarily as an but I am unable to access the variable.I have the variable being displayed in a msgbox, and it is displaying properly, I am just unsure how to access it in the SqlDataSource. Here is my code;This is the datasource that inserts the first information and received the scope_identity, as well as the _inserted event;
Code:
<asp:SqlDataSource ID="InsertPatientInfo" runat="server" ConnectionString="<%$ ConnectionStrings:DataConnectionString %>"
providername="<%$ ConnectionStrings:DataConnectionString.ProviderName %>"[code]....
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Feb 27, 2012
After the SQLDataSource gets the values from the database, I want to be able to use these values in the code behind. Kindly spare 5 minutes and give me some suggestions.
[Code]...
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Mar 30, 2009
I want to call a Stored Procedure using SqlDataSource. I've been reading the library documentation of the classes but i'm getting slightly confused. To call a stored procedure, I understand that I have to change the selectcommandtype and then set the selectcommand property to the name of the procedure.
'Change command type to stored procedure
SqlDataSource1.SelectCommandType = SqlDataSourceCommandType.StoredProcedure
'set name of stored procedure
[code].....
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May 17, 2011
So making a .Net site w/ VB + running off a MySQL server.
Trying to use a variable within the connectionstring to only retrieve certain data.[code]...
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Mar 28, 2011
I am trying to get a parameter for my update from the gridview but it is an ID column that I do not want displayed. If I display the data in a boundfield it works fine but if I set the visibility to false the parameter is no longer sent to the update stored procedure. There does not appear to be a hiddenfield column that I can put into the gridview.I have tried to set the parameters through the code behind but I am not certain on how to access the data I want the following code does not work (It sets the parameter to nothing
Protected Sub grvFacilityDisciplineBillingRate_RowUpdating(ByVal sender As Object, ByVal e As GridViewUpdateEventArgs) Handles grvFacilityDisciplineBillingRate.RowUpdating
Dim row As GridViewRow = grvFacilityDisciplineBillingRate.Rows(e.RowIndex)
[code]....
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Apr 17, 2009
I have an SqlDataSource object, linked to a GridView, which receives data from a database when executed.I'd like to add the values of the "Cost" column, to get the "TotalCost", and place it in a TextBox or Label on top of the GridView.Is it possible to just use (recycle) the data in the SqlDataSource object, instead of using another SqlDataSource object to just get the TotalCost"?
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Feb 9, 2010
I have a asp.net page that has several SqlDataSources defined that feed data into some graphs. The problem is that the graph product does not handle "no data" very well, and throws an error. I'd like this to handle the situation more gracefully-- so I need to check whether the SqlDataSource returned data or now before rendering the graph (and if not, just post a message saying "No Data" or something).
Is there an easy way to check if the data source returned data, and do this if/then without a bunch of code behind?
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Nov 7, 2010
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click[code]...
it checks the username and password in the database and redirecrs to respective page on the basis of rows returned. i'm having problem in finding a right function in the sqldatareader namespace so that it counts the number of rows affected.
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May 22, 2012
I am trying to pass a variable to a SelectCommand in SqlDataSource. I have this MyIdVal that need to be passed.
Here is the code :
<form id="form1" runat="server">
<div>
<%=MyIdVal%>
</div>
[Code]....
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Feb 24, 2011
I'm using ASP.NET/VB.NET to create this with SQL 2005. I have a project where I'd like to take a set of records from a table, then send each one through an API, get a result and writeback the result to a table, then move to the next.
Initially, my thought was create a SQLDataSource that grabs all the records, then perform the action on a button to do the action of sending through each record.
Is there a way I can call the recordset from SQLDataSource and perform a loop? I'm thinking something like in Classic ASP/VBScript where you would open a RecordSet, do an action, then Loop until the RS was EoF.
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Jan 21, 2010
I have a multiselect enabled listbox on the page that is populated from a SqlDataSource. I have another DataSource that retrieves the selected items from the database.I cannot for the life of me figure out how to set all of the selected items in the listbox. I have figured out how to get the first item from the selected items sqldatasource, but I don't know how to set ALL of the items from the sqldatasource as selected. [code]
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May 10, 2012
I'm currently trying to loop through an array (two values) and use both values in a query inside the loop Right now my code doesn't work. I'm trying to populate dynamically the "appType" parameter within the "SelectParameters" tags of the SQLDataSource, but this won't work.
[Code]...
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Apr 1, 2011
I'm trying to retrieve values using vb.net from a sql database. How do I use "SqlDataSource.Select()"? Is there a way to move the value to a variable that I can use for other things? I know its kind of scattered and vague but that is the best I can do. I basically need to set a labels text to a value in a table.
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Sep 17, 2009
I have a vb.net application that I want to dynamically create a search criteria using a SQLDataSource. I was trying to dynamically generate a select statement with parameters, assign that string to the selectCommand for the SQLDataSource then selectively assign the parameters.
The issue is several fields (user id) (user name) (email addr)... that I wanted to allow the user to enter any number of these and construct the select given what they entered.
That works if I just construct the string. But I want to use parameters for some sql injection protection as that page will be viewable on the internet.
What happens is I assign the select command but the SqlDataSource does not pick up that there are now some parameters that were not there before.
as in.
Dim firstName As String = tbFirstName.Text
Dim userName As String = tbUserName.Text
Dim userIdFlag As Boolean = False
[Code].....
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Apr 21, 2010
I am trying to programatically use my SQLdatasource in my code behind so that I can select a certain field from a table based on the selectedindexchange event of a listbox control on my form. I have one datasource already set to the listbox control but i want a seperate datasource to select a field based on the value of the listbox. I declared a new datasource sqlDataSource2, set the connectionstring to the same database/table and i have the following line set for the select statement
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Feb 8, 2011
I'm looking for the easiest way to bind data from a SqlDataSource to textboxes dropped in Visual Studio 2008.For example, I have 4 textboxes currently that have Address, City, State, Zip.I also have a SqlDataSource on the page fetching the ID of the record and selecting those 4 fields based on ID. How am I able to quickly bind each box to those particular fields selected? I would think this would be really straight forward - but seems it's not. Seems like the answer is funneled towards having to create a GridView or some type of control.
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Jun 17, 2012
So on my IssueRequest.aspx page I have a form that the customer can fillout that issues a work request to my company. However, I need to make sure that they filled out their account info which by default upon account creation equals "" in each field.
I have the following fields
Customer_ID // Auto Number
Customer__First_Name // text field size 50
Customer__Last_Name // text field size 50
Customer_Address // text field size 50
[Code]....
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Sep 15, 2010
How can I execute a stored procedure using sqldatasource and get the return value in vb.net.
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May 18, 2011
I am trying to use a label from another row in the gridview and insert it in a table when the user clicks the button which is in its own column.
my problem is that i cant get bookno which finds the label set to the @bookno in my sqldatasource
Protected Sub Button2_Click(ByVal sender As Object, ByVal e As System.EventArgs)
Dim selectedRow As Button = DirectCast(sender, Button)
Dim bookno As Label = CType(selectedRow.FindControl("label1"), Label)
[Code]....
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