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Column 'column_name' Already Belongs To Another DataTable in C#

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In a scenario where I added columns using AddRange(), I encountered an error as specified by the title.
Here's the C# code: 
table1.Columns.AddRange(new DataColumn[] { col1, col2, col3 });  
table2.Columns.AddRange(new DataColumn[] { col1, col2, col3 });
Where col1, col2, col3 are DataColumn objects.
What I did was to initialize columns in the addrange method. But there are other solutions in the forums. 
table1.Columns.AddRange(new DataColumn[] { new DataColumn("ID"), new DataColumn("WEB ID"), new DataColumn("URL") });  
table2.Columns.AddRange(new DataColumn[] { new DataColumn("ID"), new DataColumn("WEB ID"), new DataColumn("URL") });

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