Iam using updatepanel and timer controls ..

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C#

protected void Timer1_Tick1(object sender, EventArgs e)
       {
               string[] str;
               ftp = new FTPOperations();
               str = ftp.GetFileList("DCU/INST_VAL");
                   foreach (string value in str)
                   {
                       LstBox.Items.Add(value);

                   }
                   Label1.Text = DateTime.Now.ToShortTimeString();
       }

dear sir i am adding value to listbox for every 5 sec its updating and its adding previous values also..please tell me how to stop....please please help me

Posted 6-Jul-12 4:00am

skpraveenkumar

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lewax00 · Answer 1 · 2012-07-06T04:11:00

Solution 1

Call LstBox.Items.Clear(); before the foreach loop.

Posted 6-Jul-12 4:11am

lewax00

DamithSL · Answer 2 · 2012-07-06T04:17:00

you can check and add items if not already added using listBox.Items.FindByValue but you have to loop though each and every item. easy way is fist clear items and add items again.

C#

protected void Timer1_Tick1(object sender, EventArgs e)
       {
               // clear items and add them
               LstBox.Items.Clear();
               string[] str;
               ftp = new FTPOperations();
               str = ftp.GetFileList("DCU/INST_VAL");
                   foreach (string value in str)
                   {
                       LstBox.Items.Add(value);
 
                   }
                   Label1.Text = DateTime.Now.ToShortTimeString();
       }

rizwan muhammed khan gouri · Answer 3 · 2012-07-06T20:23:00

C#

protected void Timer1_Tick1(object sender, EventArgs e)
       {
               // clear items and add them
               LstBox.Items.Clear();
               string[] str;
               ftp = new FTPOperations();
               str = ftp.GetFileList("DCU/INST_VAL");
                   foreach (string value in str)
                   {
                       LstBox.Items.Add(value);

                   }
                   Label1.Text = DateTime.Now.ToShortTimeString();
LstBox.Items.clear();

       }

Iam using updatepanel and timer controls ..

3 solutions

Solution 1

Solution 2

Solution 3

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