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As Luc Says, it shoul be no problem. To help any further we would need to see the unmanaged function signature.
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Yes. I've just posted it up there.
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Hallo
my application sports a dgv bound to a datatable, which has a column with default value to DateTime.Now.
When the user add a new row, that datetime column is correctly filled; when the user saves for the first time, it correctly saves. Any next time the user try saving the row, it gives a System.FormatException "String not recognized as valid DateTime value", and stops saving.
The DateTime in the DGV appears to be formatted according the locale Culture (italian, dd/MM/yyyy hh.mm)
The DataTable.Locale is System.Globalization.CultureInfo.InvariantCulture.
If I change it to System.Globalization.CultureInfo.CurrentCulture i get an obscure exception "Found unknown word starting at index 0".
Any help?
Thanks in advance!
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Do you have a DateTimePicker in the DataGridViewCell or is it a default DataGridViewCell (Text) Field?
You may need to convert the value to a valid Date Type.
I don't speak Idiot - please talk slowly and clearly
'This space for rent'
Driven to the arms of Heineken by the wife
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Hallo
the DGV is a plain one, is bound to a BindingSource which has is DataSource property set to the DataTable.
No modification is made on the fields type: the field holding the datetime is a default DataGridViewCell, automatically created at binding.
You're giving me an interesting hint... By the way I hope that I should not create manually each column in the DataGridView to have it right typed .
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Actually playing with culture info is not good. Using the Datetime control is better.
Did u try? I used the below code. Its fine.
Sub Form_Load()
Thread.CurrentThread.CurrentCulture = New CultureInfo("en-GB", False)
End Sub
Thanks & Regards
PARAMU
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Hallo paramu, thank for the reply.
The datatable.locale is used by Microsft in many examples, I kept it for preventing any issue from handling italian characters like accents, and for datetime handling too.
I tried your code but it didn't work, neither with "en-GB" nor with "it-IT".
It sounds that this is happening:
1. the default value in datatable is correct
2. the datagridview format it as string
3. when saving, the system fails to handle the string.
I would like to try to explicitly type the datetime column, but this would require me to manually code each column of the DGV.
Ubi maior, minor cessat... I'll give it a try.
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While saving time, before to udate to your sever, it has to be
Thread.CurrentThread.CurrentCulture = New CultureInfo("en-US", False)
And while save finish it has to be again
Thread.CurrentThread.CurrentCulture = New CultureInfo("en-GB", False)
Also form_load()
Thread.CurrentThread.CurrentCulture = New CultureInfo("en-GB", False)
Thanks & Regards
PARAMU
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thanks it doesn't work.
I'll try dgv.autogeneratecolumns = false and so on.
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I'm giving up, it's quite a nightmare if the system itself doesn't understand values it automatically wrote.
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LordZoster wrote: it's quite a nightmare if the system itself doesn't understand values it automatically wrote
This is why I nearly always roll my own DAL and handle the databinding with custom business objects. 
I never use the BindingSource stuff..
I don't speak Idiot - please talk slowly and clearly
'This space for rent'
Driven to the arms of Heineken by the wife
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You mean, u need to convert it from string
MyDataTable.Rows[RowNum]["MyDateTimeField"]=Convert.ToDateTime(MyStringDate);
Are you talking about this?
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The BindingSource is supposed to handle this conversion by itself, doesn't it?
And, in case I overrun this conversion writing my own one, where should I write it?
From what I understand (very little, I admit) I should overrun a whole lot of stuff of BindingSource: in this I totally agree with Andy_J, it is preferrable to use one's own DAL.
The worst thing is, that datetime cell is readonly, so there's no need to write it back into the database from the datagridview hence no need to convert any string...
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Hi, Iam using C#2010. I have a problem with my SQL-Save {DataAdapter.Update(DataTable);}.
Actually I have created a datatable and Columns added properly. Then its getting save properly. No Problem.
But while I run a linq Query and created a DataTable, its not getting update. While I check the datatable its showing the same column name. But its not getting update. I can't understand the problem. Thanks for the Ideas.
var Results = from SelRow in MyDtb1.AsEnumerable() where SelRow.Field("door_no") != null select SelRow;
DataTable ChkResult = Results.CopyToDataTable();
ChkResult.AcceptChanges();
MySQLCon.Open();
SqlTransaction Trans1 = MySQLCon.BeginTransaction();
VeSavDAp.UpdateCommand.Transaction = Trans1;
VeSavDAp.InsertCommand.Transaction = Trans1;
myDataGrid1.CurrentCell = myDataGrid1.FirstDisplayedCell;
myDataGrid1.EndEdit();
VeSavDAp.AcceptChangesDuringUpdate = true;
VeSavDAp.Update(ChkResult);
Trans1.Commit();
MYSQLCon.Close();
Thanks For The Ideas.
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Aaahh yuck I'm not going to enjoy this.
You are running into some of the issues of using the MS datatable and adaptors combined with inline editing in list controls. Take a look into Data Access Layer (DAL) there are meny fine articles explaining this. It will give you a much better understaning of what is happening to your data.
Currently you are relying on the MS black box stuff they supply in the adaptors with no real understanding of what is going on.
Inline editing in list controls is a personal phobia, I always pop a dialog or have a details panel for editing rather than try and force the Grid.
Never underestimate the power of human stupidity
RAH
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Hi
is there a way to initialize generics using something like this:
Type myT = typeof(string)
List<myT>myList = new List<myT>();
and not directly
List<string> myList = new List<string>
Thanks for your time
modified on Sunday, May 29, 2011 4:29 PM
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Fix your post please...
I assume you mean
Type myT = typeof(double);
List<myT> myList = new List<myT>();
<Type> is evaluated at compile time, so using a runtime Type variable like that won't work.
For a possible solution, see C# specifying generic collection type param at runtime[^]
Mark Salsbery
Microsoft MVP - Visual C++
![Java | [Coffee]](https://www.codeproject.com/script/Forums/Images/coffee.gif)
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Hello everyone,
Gestures 14 + is my final year project on hand gesture recognition using computer vision.Gestures 14 + supports 14 types of hand gestures.It has also got a learning mode. 
This project uses AForge.NET framework
I want to share this with u ppl
Here is the video demonstration of the project
http://www.youtube.com/watch?v=X2BW6HbwcGo
What you guys have to say about the project??
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Nice video, but it would be more interesting if you wrote an article about it.
The best things in life are not things.
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Thanks I will write an article then.
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Hi Iam using C#2010. From my MdiParent toolstrip Iam using the following codes to open the mdichild
Public partial Class Form1 : Form
{
Form3 MyNewName=New Form3();
private void toolStripButton2_Click(object sender, EventArgs e)
{
MyNewName.MdiParent = this;
MyNewName.FormBorderStyle = FormBorderStyle.None;
MyNewName.Dock = DockStyle.Fill;
MyNewName.Show();
}
}
And For once the close button is clicked all of mdichildren use to close by its MDI_form closing event.
But the problem is I cannot reopen the form "Its saying caanot access a disposed object" And if I use
Form3 MyNewName=New Form3();
then the other subs are not running...
So how to keep the instances permanently even if the form is closed?
And Instead of Form hide any other better ideas?
Thanks & Regards PARAMU
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From Reflector, the code for Form.Close is:
public void Close()
{
if (base.GetState(0x40000))
{
throw new InvalidOperationException(SR.GetString("ClosingWhileCreatingHandle", new object[] { "Close" }));
}
if (base.IsHandleCreated)
{
this.closeReason = CloseReason.UserClosing;
base.SendMessage(0x10, 0, 0);
}
else
{
base.Dispose();
}
}
So as you can see, if you close the form, it will be disposed. If you want to keep the same instance, hide it. Otherwise, check if your field is null, if so - recreate it; if not, show it.
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