Question

What I want is to have a ComboBox which, upon SelectedIndexChanged, changes a Timer.Interval. My code basically looks like this:

public Form1()
{
    InitializeComponent();
    Timer AutoRefresh = new Timer();
    AutoRefresh.Tick += new EventHandler(AutoRefresh_Tick);
    var RefreshIntervals = new[] { "4 hours", "2 hours", "1 hour", "15 minutes", "10 seconds" };
    comboBox1.DataSource = RefreshIntervals;
    comboBox1.SelectedIndexChanged += new EventHandler(comboBox1_SelectedIndexChanged);
}

void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
    if (AutoRefresh.Enabled == true)
        AutoRefresh.Enabled = false;
    if (comboBox1.SelectedText == "4 hours")
        AutoRefresh.Interval = 14400000;
    else if (comboBox1.SelectedText == "2 hours")
        AutoRefresh.Interval = 7200000;
    else if (comboBox1.SelectedText == "1 hour")
        AutoRefresh.Interval = 3600000;
    else if (comboBox1.SelectedText == "15 minutes")
        AutoRefresh.Interval = 900000;
    else if (comboBox1.SelectedText == "10 seconds")
        AutoRefresh.Interval = 10000;
    AutoRefresh.Enabled = true;
}

Now, obviously this doesn’t work because comboBox1_SelectedIndexChanged() doesn’t have a reference to a Timer variable.

How can I modify my code to pass AutoRefresh to comboBox1_SelectedIndexChanged()?

Probably a good time to point out that I’m still a novice with C#. Please be kind.

Answer 1

The SqlDependency class may work well for you, based on the comment you made:

… The program … queries a SQL DB which fills a DataTable for display. I want to use this comboBox and the Timer to automatically refresh the DataTable …