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    <p>Pass a <code>ref</code> if you want to change what the object is:</p> <pre><code>TestRef t = new TestRef(); t.Something = "Foo"; DoSomething(ref t); void DoSomething(ref TestRef t) { t = new TestRef(); t.Something = "Not just a changed t, but a completely different TestRef object"; } </code></pre> <p>After calling DoSomething, <code>t</code> does not refer to the original <code>new TestRef</code>, but refers to a completely different object.</p> <p>This may be useful too if you want to change the value of an immutable object, e.g. a <code>string</code>. You cannot change the value of a <code>string</code> once it has been created. But by using a <code>ref</code>, you could create a function that changes the string for another one that has a different value.</p> <p>Edit: As other people have mentioned. It is not a good idea to use <code>ref</code> unless it is needed. Using <code>ref</code> gives the method freedom to change the argument for something else, callers of the method will need to be coded to ensure they handle this possibility.</p> <p>Also, when the parameter type is an object, then object variables always act as references to the object. This means that when the <code>ref</code> keyword is used you've got a reference to a reference. This allows you to do things as described in the example given above. But, when the parameter type is a primitive value (e.g. <code>int</code>), then if this parameter is assigned to within the method, the value of the argument that was passed in will be changed after the method returns:</p> <pre><code>int x = 1; Change(ref x); Debug.Assert(x == 5); WillNotChange(x); Debug.Assert(x == 5); // Note: x doesn't become 10 void Change(ref int x) { x = 5; } void WillNotChange(int x) { x = 10; } </code></pre>
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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