How to update windows form controls data from Static method

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I need to update windows form controls data from Static method. we cannot access controls from static method because they are instance fields.then how to over come this.

C#

private static void DataReceivedHandler(
                       object sender,
                       SerialDataReceivedEventArgs e)
       {
           SerialPort sp = (SerialPort)sender;
           //Thread.Sleep(1000);
           string indata = sp.ReadExisting();


        
           lblID.Text = indata;
           if (lstRFIDCards.Contains(indata))
           {
               lblIDValidationMes.Text = "ID Verified";
               lblIDValidationMes.ForeColor = System.Drawing.Color.Green;

               byte[] onBuffer = { 0XA5, 0XFF, 0X04, 0X57, 0X0F, 0X01, 0XF0, 0x0D, 0x0A };
               sp.Write(onBuffer, 0, 9);
               lblRelay.Text = "Relay ON";
              lblRelay.ForeColor = System.Drawing.Color.Green;
               Thread.Sleep(5000);
               //MessageBox.Show(indata);
               byte[] offbuffer = { 0xA5, 0xFF, 0x04, 0x57, 0x0F, 0x00, 0xF1, 0x0D, 0x0A };
               sp.Write(offbuffer, 0, 9);
              lblRelay.Text = "Relay OFF";
              lblRelay.ForeColor = System.Drawing.Color.OrangeRed;

           }
           else
           {
              lblIDValidationMes.Text = "ID Not Matched Our Records.";
              lblIDValidationMes.ForeColor = System.Drawing.Color.OrangeRed; ;
           }



       }

Posted 17-Jun-15 22:22pm

chandubbbb

Updated 17-Jun-15 22:54pm

v4

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OriginalGriff · Accepted Answer · 2015-06-17T22:58:00

The only way in practice to overcome this is: don't use a static method.

You can bodge round it by creating a static Form variable and loading it with your form instance, but it is just that: a bodge. And as soon as you have two instances of the form it all falls apart.

So look at why you need a static method, and check that you really do need a static handler: I doubt if you do in practice. And please, do remember that the DataReceived event handler is not executed on the UI thread - you will need to Invoke any controls you want to access to avoid cross thread problems.