C# duplicate DataTable but only insert rows where one value is unique
<p>I'm using the following code:</p>

<p><code>DataTable uniqueCou = CouponResult.DefaultView.ToTable(true, "URL");</code></p>

<p>This is fine exact it only adds the value URL, what I want is all 4 columns from CouponResult which are (URL,Key,Item,Value).  When I use the above code it just returns a one column unique Datatable.</p>

<p>What I really want is to insert all the rows where "URL" is unique with all the other columns.  If i include the other 3 columns in DefaultView.ToTable(true, "URL");` the result is actually not unique.</p>
