change Backcolor with an interval

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Hi,
I want to change a DataGridView BackColor with an interval.I need it shows black and after 5 seconds turns to yellow.I use the following code but it didn't work.

C#

dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Black;
Thread.Sleep(5000);
dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Yellow;

It just shows the yellow color and black is not shown.Is there anyway to handle this?
Thanks.

Posted 23-Apr-13 6:48am

mehdi_13

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[no name] 23-Apr-13 13:03pm

Think about what your code is doing. You set the color to black and then put the thread to sleep so the color cannot update then you set the color to yellow. Use a timer.

mehdi_13 23-Apr-13 14:40pm

I use the following code but it didn't work.

DateTime start = DateTime.Now;
dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Black;
TimeSpan interval = DateTime.Now - start;
while (interval.TotalSeconds<5)
{
interval = DateTime.Now - start;
}
dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Yellow;

[no name] 23-Apr-13 15:08pm

It did not work because that is no how to use a timer.

mehdi_13 23-Apr-13 15:14pm

could you tell me how to use it?

[no name] 23-Apr-13 15:29pm

Can you not read the documentation?

mehdi_13 23-Apr-13 15:36pm

I just don't know what is the difference between timer and a regular loop in this case.

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mehdi_13 · Answer 1 · 2013-04-23T08:52:00

Solution 1

I handle it with following code but I'm not sure it's the best way or not.

C#

dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Black;
Application.DoEvents();
Thread.Sleep(5000);
dataGridView1.Rows[0].DefaultCellStyle.BackColor = Color.Yellow;

Posted 23-Apr-13 8:52am

mehdi_13

Comments

[no name] 23-Apr-13 15:07pm

DoEvents is evil

Kenneth Haugland 23-Apr-13 15:11pm

Thread.Sleep is eviler :-), should use dispatchertimer or a stopwatch instead.