Blinking of rows in Datagridview by comparing particular column values

Devaraj Subramaniam

Hi Friends,
I am using Data grid view for displaying the data from data table.Displaying is working correctly.Now i want to make rows as blinking while the color is red and white.for Example: the first row is Purple and white , second row is Red and White,third row is also red and White. we need to blink the row having "Red and White".In that both color changes continuosly as interval of one second. Please help me to achieve it.

Thanks and Regards,
DJ

6 Replies

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Vulpes14y ago
So are you saying that the red and white colors are blinking at the same time but not necessarily at 1 second intervals?

If so, then that could be due to shortcomings in the System.Windows.Forms.Timer which executes on the UI thread and can therefore be pre-empted by other events occurring within that thread.

To avoid that, you could try the multi-threaded timer, System.Timers.Timer, instead. Notice though that the Elapsed event is processed on a worker thread and so you may need to marshal accesses to the datagridview control back to the UI thread:

http://msdn.microsoft.com/en-us/library/system.timers.timer.aspx
Devaraj Subramaniam14y ago
Hi vulpes,
Thanks for your response.
I tried this thing also.. blinking happens but at sometime the blinking interval varies accordingly.. red color blinked for very few milliseconds and also same for white color also..
we tried for using two timers also but same problem there also.

Thanks in Advance,
Dj
Vulpes14y ago
I've changed the code so that it's now blinking to blue and yellow i.e. the forecolor is changing as well.

However, it's working fine on my machine - both colors are blinking simultaneously - and, unless you're using two timers, I can't think of any obvious reason why it would not work properly:

private void timer1_Tick(object sender, EventArgs e)
{
for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
{
DataGridViewRow row = dataGridView1.Rows[i];
if (row.IsNewRow) break;
if (redWhite && row.DefaultCellStyle.BackColor == Color.Red && row.DefaultCellStyle.ForeColor == Color.White)
{
row.DefaultCellStyle.BackColor = Color.Blue;
row.DefaultCellStyle.ForeColor = Color.Yellow;
redWhite = false;
}
else if (!redWhite && row.DefaultCellStyle.BackColor == Color.Blue && row.DefaultCellStyle.ForeColor == Color.Yellow)
{
row.DefaultCellStyle.BackColor = Color.Red;
row.DefaultCellStyle.ForeColor = Color.White;
redWhite = true;
}
}
}
Devaraj Subramaniam14y ago
Hi vulpes,
Thanks for your response..
Actually we done like this already.its blinking but wat's the problem we are facing is not blinking properly . ie., red color should be 1 sec and white color should be 1 sec simultaneously. but its not blink like that..

Thanks,
Dj
Vulpes14y ago
Add a timer to your form and set its Interval property to 1000 milliseconds and its enabled property to true (if you want the blinking to start straigthaway).

Next add a bool field to your form:

private bool redWhite = true;

Finally, double click on the timer in the VS designer to generate a skeleton click handler and add code to it on the following lines. This assumes you want to blink to black and white but you can, of course, blink to any other color combination which isn't used for any other rows:

private void timer1_Tick(object sender, EventArgs e)
{
for (int i = 0; i < dataGridView1.Rows.Count - 1; i++)
{
DataGridViewRow row = dataGridView1.Rows[i];
if (row.IsNewRow) break;
if (redWhite && row.DefaultCellStyle.BackColor == Color.Red && row.DefaultCellStyle.ForeColor == Color.White)
{
row.DefaultCellStyle.BackColor = Color.Black;
redWhite = false;
}
else if (!redWhite && row.DefaultCellStyle.BackColor == Color.Black && row.DefaultCellStyle.ForeColor == Color.White)
{
row.DefaultCellStyle.BackColor = Color.Red;
redWhite = true;
}
}
}
Jignesh Trivedi14y ago
hi Dev,

You can achieve this using Jquery or java script.

Please refer

http://www.aspmemo.net/2012/03/gridview-rows-blink-using-jquery-in.html

http://www.dotnetspider.com/resources/37638-Blinking-Text-within-Gridview.aspx

hope this will help you.