Cannot Copy and paste word content into rich textbox at runtime

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VB

Visual-Studio

I have a rich text box in my form and that field name is description.

its datatype is nvarchar(max).

now i have a text almost a big paragraph. So at runtime when i am writing,its showing error,so 3 times nearly i have written it,but it failed to get inserted in database.

So i wrote the text in word and when i use ctrl C and ctrl+v to paste it in rich text box at runtime, its not getting copied.

How do i insert my big paragraph in rich textbox?

Can anyone help me please?
Please