.NET Framework - Cannot clear all rows in datagridview

Asked By Bill Nguyen

21-Mar-07 05:54 PM

I tried almost everything
.Rows.clear()
.rowcount = 0
and the rows in a datagridview still not cleared

I populated the Datagridview manually using Row.Add

Any help is greatly appreciated

Bill

21-Mar-07 09:18 PM

How do you know that the clear() method is not working?

22-Mar-07 03:50 AM

The code below works in a simple form with a DataGridView and Button
dropped on it.

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Me.DataGridView1.ColumnCount = 3
Me.DataGridView1.AllowUserToAddRows = False

Me.DataGridView1.Rows.Add(New String() {"abc", "efg", "hij"})
Me.DataGridView1.Rows.Add(New String() {"111", "efg", "hij"})
Me.DataGridView1.Rows.Add(New String() {"222", "efg", "hij"})

End Sub

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e
As System.EventArgs) Handles Button1.Click
'either works
Me.DataGridView1.RowCount = 0
'Me.DataGridView1.Rows.Clear()
End Sub
==========================
Clay Burch
Syncfusion, Inc.

23-Mar-07 01:45 PM

Me.DataGridView1.RowCount = 0
Me.DataGridView1.Rows.Clear()

It didn't work on mine.
Is it a problem with version/SP update?
I'm usign VS 2005. Info as below

Thanks
Bill


Microsoft Visual Studio 2005
Version 8.0.50727.42  (RTM.050727-4200)
Microsoft .NET Framework
Version 2.0.50727

Installed Edition: Professional

Microsoft Visual Basic 2005   77626-009-0000007-41468
Microsoft Visual Basic 2005

Microsoft Visual C# 2005   77626-009-0000007-41468
Microsoft Visual C# 2005

Microsoft Visual C++ 2005   77626-009-0000007-41468
Microsoft Visual C++ 2005

Microsoft Visual J# 2005   77626-009-0000007-41468
Microsoft Visual J# 2005

Microsoft Visual Web Developer 2005   77626-009-0000007-41468
Microsoft Visual Web Developer 2005

Crystal Reports    AAC60-G0CSA4B-V7000AY
Crystal Reports for Visual Studio 2005


Security Update for Microsoft Visual Studio 2005 Professional Edition - ENU
(KB925674)
This Security Update is for Microsoft Visual Studio 2005 Professional
Edition - ENU. \n
If you later install a more recent service pack, this Security Update will
be uninstalled automatically. \n
For more information, visit http://support.microsoft.com/kb/925674

SQL Server Analysis Services
Microsoft SQL Server Analysis Services Designer
Version 9.00.3042.00

SQL Server Integration Services
Microsoft SQL Server Integration Services Designer
Version 9.00.2047.00

SQL Server Reporting Services
Microsoft SQL Server Reporting Services Designers
Version 9.00.2047.00

23-Mar-07 02:44 PM

I'll try again. How, exactly, do you know that Clear() is not working?
Have you added code to your application to check the remaining contents of
the DataTable within your DataGridView during the same run, or are you
checking your DataSource while in design mode?

23-Mar-07 03:34 PM

I'm not going that far.
The Datagridview was still showing data. I want it to be cleared in my view.
If it cleared but I can still see all the rows and columns on the screen, I
would say that it's not working!

Thanks

Bill

23-Mar-07 06:22 PM

I would agree :)

Here's an article written on the subject that may be useful:


I guess it depends on how you're populating the DataGridView. If it's bound
to a data source then I would remove the binding; otherwise, if the rows
were added manually then I would just clear the rows collection.

if (this.dataGridView1.DataSource != null)
{
this.dataGridView1.DataSource = null;


}


else
{
this.dataGridView1.Rows.Clear();


}


Does that work in your situation?

--
Tim Wilson
.NET Compact Framework MVP



I realize the code is C#, but the translation should pose no problems. Works
for me.