No rows were deleted

Error:
- A SQL Server Database contains some tables but one of table's rows cannot be deleted!!
- How i can delete some NULL rows in my table ?
- Can't delete rows (...) in Microsoft Visual Studio ...

Error Message:

No rows were deleted.
A problem occured attempting to delete row 3.
Error Source: Microsft.VisualStudio.DataTools.
Error Message: The row value(s) updated or deleted either do not make
the row unique or they alter multiple rows (3 rows)
Correct the errors and attempt to delete rows again or press ESC to cancel the change(s)

Problem Causes:
This issue occurs if the following conditions are true:
- The table contains one or more columns of the text or ntext data type.
- The value of one of these columns contains the following characters:
      - Percent sign (%)
      - Underscore (_)
      - Left bracket ([)
- The table does not contain a primary key.

Solution:
This is a Microsoft BUG (BUG-925719)
There's not any solution. You need to have a new table with a primary key or correct values and copy data into new table and drop old table, Sorry.

Solution In Microsoft Visual Studio (NEW):
- Goto Server Explorer
- Goto Database > Tables > The Table
- RightClick and Select Edit Table Schema
- ADD a new Column with these options
        - Data Type: uniqueidentifier
        - Allow Nulls: No
        - Unique: Yes
        - Primary Key: Yes
        - Is RowGuid: True
- Save and Close and open Table and delete rows ;-)

REF: http://amastaneh.blogspot.com/2012/01/no-row-was-updated.html