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There is no code here to update the datagrid. You would need to refresh it after the database has been updated. E.g. set the datasource to null and then rebind it or use a BindingSource.
If the database is not being updated by this query then debug it to ensure the value for Id matches what you have in your data
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When I change the data in the cells of the DataGridView, and I debug, the values that are shown are the new ones, but at the end the DataGridView is not updated. Can you please give an example of possible code to complete what I already have? Thanks.
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How do you populate the DataGridView? And how are you changing the data in the cells? By typing over what is there? What do you mean by "at the end" ... at the end of what?
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By the end I mean after cliking in the button "upgrade" where this code is inserted. I change data by typing over what is in the cell.
I populate the datagrid this way:
using (OdbcConnection connection = CreateConnection())
{
OdbcCommand Command = new OdbcCommand("insert into lojas (NIF, Loja, bloqueado, DataFim, lastupdate, Nome) values (?, ?, ?, ?, ?, ?)", connection);
Command.CommandType = CommandType.Text;
Command.Parameters.AddWithValue("@N IF", grid_lic.CurrentRow.Cells[1].Value);
Command.Parameters.AddWithValue("@Loja", grid_lic.CurrentRow.Cells[2].Value);
Command.Parameters.AddWithValue("@Bloqueado", grid_lic.CurrentRow.Cells[3].Value);
Command.Parameters.AddWithValue("@DataFim", grid_lic.CurrentRow.Cells[4].Value);
Command.Parameters.AddWithValue("@lastupdate", grid_lic.CurrentRow.Cells[5].Value);
Command.Parameters.AddWithValue("@Nome", grid_lic.CurrentRow.Cells[6].Value);
Command.ExecuteNonQuery();
}
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Ok - that code is not populating the datagrid it's updating the database - are you saying that the DataGrid is bound to the database?
You refer to this as a DataGrid - is this in an ASP page? In which case are you checking for PostBack?
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The datagrid is bound to the database. This is the connection command:
private static OdbcConnection CreateConnection()
{
return new OdbcConnection("driver= {MySQL ODBC 5.1 Driver};server=192.168.19.78; database=licenciamento; uid=estagio; password=1234; option = 3 ");
}
It is not an ASP page, it is only windowsform.
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Hi, all friends:
i want to get a efficient function to sort array, and return a old array index .
For example: double[] a=[5,4,1,3,2];
how can i get b is [1,2,3,4,5],and index array c is [2,4,3,1,0]?
i want a efficent and quick method...
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There is no built in method that will do that for you - the index to the previous array is what causes the problem - and you can't "retrospectively" find it because in the event of duplicates, you don;t know which value to use.
What I would probably do is package the value you want to sort into a struct together with it's original index and sort that, using a comparator that looked only at the values.
The resulting sorted info would include the original array index, and it would be pretty trivial to split them back up if you needed to.
public struct sortable
{
double value;
int index;
}
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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Array.Sort has an overload that takes and array of keys and an array of values. If you sort [0,1,2,3,4] with the keys [5,4,1,3,2], it will give you [2,4,3,1,0], as you wanted.
sandbox[^]
modified 15-Dec-15 7:54am.
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good idea,smart!!!
and i would to know how to generate array 0 to 100 , not use loop?
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Apart from typing it out manually? Just use a loop.
int[] index = new int[100];
for (int i = 0; i < index.Length; i++)
index[i] = i;
inb4 Enumerable.Range(0, 100).ToArray() - oh sure, but that has the same loop, and also does a bunch of array allocations and copies. Sweeping a loop under the rug doesn't make it go away.
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A little Linq, perhaps:
int[] iary = new[] { 5, 4, 1, 3, 2 };
var sorted = iary.OrderBy(itm1 => itm1).ToArray();
var unsortedIndexes = sorted.Select(itm2 => Array.IndexOf(iary, itm2, 0)).ToArray();Note that using 'OrderBy creates a copy of the Array.
>? sorted
{int[5]}
[0]: 1
[1]: 2
[2]: 3
[3]: 4
[4]: 5
> ? unsortedIndexes
{int[5]}
[0]: 2
[1]: 4
[2]: 3
[3]: 1
[4]: 0
> ? iary
{int[5]}
[0]: 5
[1]: 4
[2]: 1
[3]: 3
[4]: 2
«Tell me and I forget. Teach me and I remember. Involve me and I learn.» Benjamin Franklin
modified 15-Dec-15 11:23am.
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hi, i have a question.
When i use chart1.invalidate() to refresh chart, it had 3 ms cost betten call chart_paint(), Then i called chart_paint() manully on other thread, it cost less than 1ms,it can reach my requirement. But chart has no refresh, it can not clean up history paint.
So i want to know how to invalidate chart control ,but not to call paint aotumatic?
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Have you tried over-riding the Paint Event ?
«Tell me and I forget. Teach me and I remember. Involve me and I learn.» Benjamin Franklin
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how can i overriding the paint event? please help me a example
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I got problem with ComboBox in winforms c#. Comboboxes in main window works fine, but comboboxes in form that I open in panel on main window are broken. The wierd things starts to happen... I cant click it to type. I can only open list, select one and then type. Also i cant locate cursor in the middle of text because it highlight whole text. I post code with I open form in panel:
public void otworzOkno(Form _form)
{
if (Application.OpenForms[_form.Name] != null)
{
Application.OpenForms[_form.Name].WindowState = FormWindowState.Normal;
Application.OpenForms[_form.Name].BringToFront();
}
else
{
_form.TopLevel = false;
_form.AutoScroll = true;
this.panel.Controls.Add(_form);
_form.Show();
_form.BringToFront();
}
}
Video that will explain problem: https://youtu.be/PrVxFWvhPyc
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how have you constructed the comboboxes?
do they have an assigned datasource?
do they share datasources?
how you are showing the way that you are opening the form that they are on doesn't show the problem it's on that form.
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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The problem is that the form is opened in panel, because when i open the same form with the same settings in seperate window not in panel it works fine. I dont know why that happen
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as a Test I would change your code to this, I do something similar but I use a splitter container.
public void otworzOkno(Form _form)
{
if (Application.OpenForms[_form.Name] != null)
{
Application.OpenForms[_form.Name].WindowState = FormWindowState.Normal;
Application.OpenForms[_form.Name].BringToFront();
}
else
{
_form.TopLevel = false;
_form.Parent = panel;
_form.Show();
_form.BringToFront();
}
}
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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Still the same, even when I tried in SplitContainer ;/
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you then need to show how the combo's are generated and populated.
Every day, thousands of innocent plants are killed by vegetarians.
Help end the violence EAT BACON
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I create it in visual studio (from toolbox) and even empty comboboxes with default settings, no code, just draged and droped has the same behaviour.
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..which is tucked away in a method called "InitializeComponent". That method is called when the form is created. Hiding the form and showing it won't execute the method again. Yes, that may cause weird stuff.
I'd recommend showdialog a form and disposing it when done, preferably wrapped in a using-construct.
--edit
foxed fixed typo.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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