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I think you need to look into SelectedItem <br />
<br />
Here are the properties<br />
<br />
<a href="https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listbox_properties(v=vs.110).aspx" rel="ugc">https://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.listbox_properties(v=vs.110).aspx</a>
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<div>
This is desktop -application, not web-app.
</div>


<div>
Windows Forms also has those properties<br />
<br />
<a href="https://msdn.microsoft.com/en-us/library/system.windows.forms.listbox(v=vs.110).aspx" rel="ugc">https://msdn.microsoft.com/en-us/library/system.windows.forms.listbox(v=vs.110).aspx</a>
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<div>
I suppose that the code is something like this<br />
<br />
int item = listBox1.ValueMember.First<wbr />;
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<div>
OR something like that<br />
&nbsp;int item = Convert.ToInt32(listBox1.V<wbr />alueMember<wbr />.First(lis<wbr />tBox1.Item<wbr />s));
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<div>
I tried this; &nbsp;int item = Convert.ToInt32(listBox1.S<wbr />electedVal<wbr />ue);<br />
, but it didn't work.
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<div>
this works almost:<br />
&nbsp; &nbsp;int item = Convert.ToInt32(listBox1.S<wbr />electedIte<wbr />m.ToString<wbr />());<br />
<br />
It shows wanted row like this : {SelectedItem= &quot;3\t\tSometext\t\tSometext<wbr />\t\tSomete<wbr />xt&quot;}<br />
<br />
Problem is how to pick &quot;3&quot; from the string.
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<div>
I tried also this:<br />
<br />
&nbsp; string teksti = listBox1.SelectedItem.ToSt<wbr />ring();<br />
<br />
&nbsp; &nbsp; int item = Convert.ToInt32(teksti.Sub<wbr />string(0, teksti.IndexOf(&quot; &quot;))); <b> &lt;-- Converting problem!</b>
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<div>
This works:<br />
<br />
string teksti = listBox1.SelectedItem.ToSt<wbr />ring();<br />
<br />
&nbsp; &nbsp; int item = Convert.ToInt32(teksti.Sub<wbr />string(0, teksti.IndexOf(&quot;\t\t &quot;)));
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<div>
good that you figured &nbsp;it out.
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<div>
<div class="content wysiwyg-content">
I have listbox which has many rows.<br />
First word in every row is PersonId.<br />
I want pick this Person Id and use it in SQL Query like this: &quot;&nbsp;SELECT * FROM mydatatable WHERE ID = '&quot;+ PersonId+&quot;'.
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</div>


I have listbox which has many rows.
First word in every row is PersonId.
I want pick this Person Id and use it in SQL Query like this: " SELECT * FROM mydatatable WHERE ID = '"+ PersonId+"'.

C# How to pick Person id from listbox string?

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).