Error Handling In Datagridview Cell Editing
resources Windows Server 2012 resources Programs MSDN subscriptions Overview Benefits Administrators Students Microsoft Imagine Microsoft Student Partners ISV Startups TechRewards Events Community Magazine Forums Blogs Channel 9 Documentation APIs and reference Dev centers Retired content Samples We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Controls to Use on Windows Forms DataGridView Control Data Entry in the Windows Forms DataGridView Control Data Entry in the Windows Forms DataGridView Control Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms DataGridView Control Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms DataGridView Control Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms DataGridView Control How to: Specify the Edit Mode for the Windows Forms DataGridView Control How to: Specify Default Values for New Rows in the Windows Forms DataGridView Control Using the Row for New Records in the Windows Forms DataGridView Control Walkthrough: Validating Data in the Windows Forms DataGridView Control Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms DataGridView Control How to: Handle Errors That Occur During Data Entry in the Windows Forms DataGridView Control TOC Collapse the table of content Expand the table of content This documentation is archived and is not being maintained. This documentation is archived and is not being maintained. Walkthrough: Handling Errors that Occur During Data Entry in the Windows Forms DataGridView Control .NET Framework (current version) Other Versions Visual Studio 2010 .NET Framework 3.5 .NET Framework 3.0 .NET Framework 2.0 Handling errors from the underlying data store is a required feature for a data-entry application. The Windows Forms DataGridView control makes this easy by exposing the DataError event, which is raised when the data store detects a constraint violation or a broken business rule.In this walkthrough, you will retrieve rows from the Customers table in the Northwind sample database and display them in a DataGridView control. When a duplicate CustomerID value is detected in a new row or an edited existing row, the DataError event will occur, which will be handled by displaying a Messag
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up DataGridView DataError Event Preserve invalid row up vote https://msdn.microsoft.com/en-us/library/t4a23xx4(v=vs.110).aspx 3 down vote favorite I am working on a Winforms app that displays a DataGridView, bound to some database table. It allows inserting fresh entries in to it, and does some data validation. When a required column is left blank, or one of the unique constraints is violated, the DataError event calls this function: protected void _data_error(object sender, DataGridViewDataErrorEventArgs e) { MessageBox.Show(this,e.Exception.Message,"Error"); e.ThrowException = false; e.Cancel = false; http://stackoverflow.com/questions/13495900/datagridview-dataerror-event-preserve-invalid-row } When the popup is closed, the new row that was being edited is removed. When this is done to a row that has already been saved (an update operation) the row loses its changes and loses focus. I assume this means I need to signal the application to keep the row editable, but I do not know how to do that. Paradoxically, if I replace the event handler with a throw(e.Exception) the exception gets thrown to the wind and is picked up by the uncaught exception handler, but the new row is preserved after that window closes. How can I preserve the new row on a DataError event? Edit: My next thought was to save the row and add it to the DataGridView's data source after the MessageBox pops up. That does not work because adding data to the data source add's it as a committed row which throws an exception because of the invalid data vs keeping the data as an editable row so that validation doesn't happen. c# winforms datagridview share|improve this question edited Nov 21 '12 at 17:20 asked Nov 21 '12 at 14:54 Chris 1,72931739 add a comment| 2 Answers 2 active oldest votes u
Handle DataGridView errors in C# Posted on November 28, 2014 by Rod Stephens This example shows how you can handle DataGridView errors when you modify the data in the http://csharphelper.com/blog/2014/11/handle-datagridview-errors-in-c/ DataGridView control. The example Build a DataTable and bind it to a DataGridView in https://www.experts-exchange.com/questions/24154225/How-do-I-catch-a-Datagridview-format-exception-and-set-cell-to-DBNull-value.html C# shows how to use a DataGridView control to display the data in a DataTable created in code. The DataTable ensures that its data meets its restrictions. For example, the DataTable won't let the program add a record to the data that is missing a required field or that is the wrong data type. If error handling the DataTable is associated with a DataGridView and the user tries to enter invalid data, the DataGridView displays an ugly dialog that describes the error and includes a sack trace. If you don't want to display the default dialog, you can catch the DataGridView control's DataError event. Your code can try to figure out what it wrong, or at least tell the user that the data is invalid in error handling in more friendly terms. This example uses the following DataError event handler to tell the user when a problem occurs. // An error in the data occurred. private void dgvPeople_DataError(object sender, DataGridViewDataErrorEventArgs e) { // Don't throw an exception when we're done. e.ThrowException = false; // Display an error message. string txt = "Error with " + dgvPeople.Columns[e.ColumnIndex].HeaderText + "\n\n" + e.Exception.Message; MessageBox.Show(txt, "Error", MessageBoxButtons.OK, MessageBoxIcon.Error); // If this is true, then the user is trapped in this cell. e.Cancel = false; } This code simply displays a message telling the user which column had the error and what the exception was. It also sets e.Cancel to false to allow the event to continue to propagate, and that ends the change. If you don't do this, then focus remains in the cell that has the error and the user must fix it before moving to a new cell. This entry was posted in controls, database and tagged C#, C# programming, catch errors, controls, database, DataError, DataGridView, DataTable, error handling, errors, example, example program, exception handling, handle errors, Windows Forms programming. Bookmark the permalink. ← Build a DataTable and bind it to a DataGridView in C# Force garbage collection in C# → Leave a
for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > How do I catch a Datagridview format exception and set cell to DBNull.value Want to Advertise Here? Solved How do I catch a Datagridview format exception and set cell to DBNull.value Posted on 2009-02-18 .NET Programming C# 1 Verified Solution 3 Comments 6,059 Views Last Modified: 2013-12-17 I have a bound DataGridView with one of its columns bound to a float column of a datatable. When the contents of a cell in this column are deleted (the user deletes the contents by entering the cell and pressing the delete key on the keyboard) and the user naviagtes away from this cell I get a Format Exception. How do I catch this error and enter DBNull.value into the cell. I can catch the dataerror event and call e.cancel to return to the original value but I want to set the cell value to null (or even 0.0) when the contents have been deleted. 0 Question by:bencmorrow Facebook Twitter LinkedIn Google LVL 2 Best Solution byJulienVan Hi, Yes that is why I proposed to change this value directly into the DataTable. But it means finding the row of your DataTable with a unique identifier of the line, and that is why I asked you if you Go to Solution 3 Comments LVL 2 Overall: Level 2 C# 2 .NET Programming 1 Message Expert Comment by:JulienVan2009-02-19 Hi bencmorrow, You can use the DataError event of your datagridview control to catch the exception and change the value in the datatable. Do you have an Id column that can permit to find the corresponding row in the datatable (see non tested attached code example)? Julien private void dataGridView1_DataError(object sender, DataGridViewDataErrorEventArgs e) { DataGrid