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POCan't get ComboBox to update/refresh
 

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  1. POCan't get ComboBox to update/refresh
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    <p>I have 2 forms, which I'll call Form1 and Form2. In Form1 is the following code:</p> <pre><code>public void PrinterDD() { printer.Items.Clear(); string sprinters = @"filepath"; using (StreamReader reader = new StreamReader(sprinters)) try { while (!reader.EndOfStream) { string strPrnItem = reader.ReadLine(); MessageBox.Show(strPrnItem); //just here for troubleshooting purposes printer.Items.Add(strPrnItem); } } finally { reader.Close(); printer.Update(); printer.SelectedIndex = 0; } } </code></pre> <p>This method is called first when Form1 loads. The combobox ("printer") is populated correctly.</p> <p>In Form2, I have a method to write to the file and change it:</p> <pre><code>private void accept_Click(object sender, EventArgs e) { this.AcceptButton = accept; if (selectedprinters != null &amp;&amp; selectedprinters.Items != null &amp;&amp; selectedprinters.Items.Count &gt; 0) { File.Delete(sprinters); StreamWriter writer = new StreamWriter(sprinters); try { foreach (object item in selectedprinters.Items) { writer.WriteLine(item.ToString()); } } finally { writer.Close(); Voicemails.PrinterDD(); } } this.Close(); } </code></pre> <p>The line <code>Voicemails.PrinterDD();</code> runs the method from Form1 above. When stepping through the code, everything seems to work fine; no errors, the text file does get written with the new values. But the combobox never actually updates/refreshes to show the new strings.</p> <p>What am I doing wrong?</p> <p>EDIT. I have tried <code>printer.Refresh();</code> instead of <code>printer.Update();</code> in the Form1 code.</p> <p>ps. The file I'm using is a text file, so I don't think I'm able to bind the combobox to it, so I don't think doing <code>printer.DataSource = null</code> and then rebinding it would work.</p>
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    1. USKevin
    1. USKurt
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    1. COPlease don't prefix your question titles with "C#". That's what the tags are for?
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      1. POCan't get ComboBox to update/refresh
      1. USJohn Saunders
    2. COWhat is the `Voicemails` object? Is it an instance of `Form1`?
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      1. POCan't get ComboBox to update/refresh
      1. USJim H.
    3. COSorry. Voicemails is the actual class name of Form1. I just said Form1 for simplicity's sake
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      1. POCan't get ComboBox to update/refresh
      1. USKurt
 

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