unique - How to make "No Duplicates" column in SQL Server 2008? -

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I have a simple table in my SQL Server database This table has two columns: ID int, name nvarchar (50) . The ID column is the primary key for my table.

I want to be " name " column " (no duplicate) ", such as in Microsoft Access, but this column is not the primary column How can I do this?

Add one for that column: 

  SQL Management Studio UI To add it through: 
 
     
  1.  Open SQL Server Management Studio. 
     
     
     
    2.  
  2.  Expand the  tables  in the database's folder, where you want to interrupt. 
    3.  
  3.  Right-click on the table where you want to add constraint and click  Design . 
    4.  
  4.  In the table designer, click on  Index / Key . 
    5.  
  5.  Click  Add . 
    6.  
  6.  Select  Unique Key  in the Type drop-down list. 
    7.  
 
 To handle such a situation where there is a unique obstacle infringement,

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