[Last Call] Learn about multicloud storage options and how to improve your company's cloud strategy. Register Now

x
?
Solved

How do you handle data validation (OnRowValidating) in a DataGridView

Posted on 2009-07-08
3
Medium Priority
?
611 Views
Last Modified: 2012-05-07
If a user leaves a record in a DataGridView and they haven't entered a required field I keep getting system.Data.NoNullAllowedException. ..
I'm trying to catch it with the code below but it doesn't work.  Is there an easy way to do this?

Thanks,
Private Sub myDataGridView_RowValidating(ByVal sender As System.Object, ByVal e As System.Windows.Forms.DataGridViewCellCancelEventArgs) Handles myDataGridView.RowValidating
        Try
        Catch ex As NoNullAllowedException
            MessageBox.Show("You left a record without filling in all of the required fields " & ex.Message)
        End Try
    End Sub

Open in new window

0
Comment
Question by:FatalErr
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
3 Comments
 
LVL 15

Expert Comment

by:JackOfPH
ID: 24810053
0
 
LVL 13

Accepted Solution

by:
drypz earned 2000 total points
ID: 24810422
Hi! Try this...
        private void Form2_Load(object sender, EventArgs e)
        {
            FillGridView();
        }
 
        private void FillGridView()
        {
            dataGridView1.Columns.Add("Column1", "Name");
            dataGridView1.Columns.Add("Column2", "Age");
        }
 
        private void dataGridView1_RowValidating(object sender, DataGridViewCellCancelEventArgs e)
        {
            if (dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].IsInEditMode)
            {
                if (string.IsNullOrEmpty(dataGridView1.Rows[e.RowIndex].Cells[e.ColumnIndex].FormattedValue.ToString()))
                {
                    MessageBox.Show("Please enter value.");
                    e.Cancel = true;
                }
            }
 
        }

Open in new window

0
 
LVL 1

Author Comment

by:FatalErr
ID: 25388788
I ended up using the DataError event which seems to be designed for what I needed.
0

Featured Post

What is SQL Server and how does it work?

The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Summary Displaying images in RichTextBox is a common requirement with limited solutions available. Pasting through clipboard or embedding into RTF content only support static images.  This article describes how to insert Windows control objects int…
It seems a simple enough task, yet I see repeated questions asking how to do it: how to pass data between two forms. In this article, I will show you the different mechanisms available for you to do just that. This article is directed towards the .N…
Is your data getting by on basic protection measures? In today’s climate of debilitating malware and ransomware—like WannaCry—that may not be enough. You need to establish more than basics, like a recovery plan that protects both data and endpoints.…
This lesson discusses how to use a Mainform + Subforms in Microsoft Access to find and enter data for payments on orders. The sample data comes from a custom shop that builds and sells movable storage structures that are delivered to your property. …

650 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question