Truncates string or binary data. The statement has been terminated ......

Truncates string or binary data. The statement has been terminated ......
When designing a database, I want to design an ncontent field in a table. The data type of this field is varchar (50). Because it is created in visual mode, I didn't pay too much attention to it, it may be because of the accidental sliding force of the mouse pulley, which leads to the data in the ncontent field becoming nvarchar () type, therefore, when you add data later, "the string or binary data will be truncated. The statement has been terminated ......" Error prompt...
Haha, it's amazing to solve it .....