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POHow do I set a value if a method is called from a child form?
 

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  1. POHow do I set a value if a method is called from a child form?
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    <p>My application currently has 2 forms. It creates a sub form, Form2, which ends with the following code:</p> <pre><code>public partial class Form2 : Form { ... Form1 frm = new Form1(); frm.rglu = glu; frm.rdate = fulldate; frm.sort(); Close(); } </code></pre> <p>Note that form1 is just a couple of buttons at the moment. One starts off Form2 as follows:</p> <pre><code> private void button2_Click(object sender, EventArgs e) { using (Form2 AcqForm = new Form2()) { AcqForm.ShowDialog(this); } } </code></pre> <p>No other code runs except a button <code>test();</code> shown later). This <code>frm.sort();</code> runs the following code found in Form1:</p> <pre><code>public partial class Form1 : Form { public void sort() { datelist = new List&lt;DateTime&gt;(rdate); datelist.Sort((a, b) =&gt; a.CompareTo(b)); var result = rdate .Select((d, i) =&gt; new { Date = d, Int = rglu[i] }) .OrderBy(o =&gt; o.Date) .ToArray(); this.rdate = result.Select(o =&gt; o.Date).ToArray(); this.rglu = result.Select(o =&gt; o.Int).ToArray(); //all works fine for (int i = 7; i+7 &lt;= rglu.Length; i++) { Console.WriteLine(Convert.ToString(rdate[i]) + Convert.ToString(rglu[i])); } //This shows values as expected } } </code></pre> <p>However when I set a button to run some more code using <code>rglu</code> and <code>rdate</code> the I get null pointer errors:</p> <pre><code>public partial class Form1 : Form { private void test(object sender, EventArgs e) { for (int i = 7; i &lt; rglu.Length; i++){} //rglu is null! The values are lost. } } </code></pre> <p>I believe the solution requires a <code>int[] rglu {get; set;}</code> method. However so far I have been unsuccessful in using these things at all. Has anyone encountered this problem?</p> <p>Edit: rglu is defined like this:</p> <pre><code>public int[] rglu { get; set; } //I don't get how this works though </code></pre>
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    1. COIs `Sort()` being executed before you call `test()`?
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    2. COYes it is being called beforehand.
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    3. COWhen you call `Close()` in your initial snippet I suppose you've just closed Form2? Did you launch Form1 in some code that you haven't provided? Is the `test()` method on Form1 or Form2?
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