How to store ckeditor values in the database without removing validations input?

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ASP.NET

.NET

CKEditor

I had integrated CKEditor in the asp.net project but When I tried to store it in the database it gives an error,
"

A potentially dangerous Request.Form value was detected from the client (Post_Content="<p>Test</p>
").

"
In order to overcome the problem, I added the

validationrequest = false.

then it works.Instead of doing this, due to security concerns, I have encrypted the value and stored it in the database but the moment I removed

validationrequest = false.

it gives the same error despite storing them as encrypted files. So how to store Ckeditor values in the database without removing validations input?

What I have tried:

byte[] data = System.Text.Encoding.UTF8.GetBytes(post.Post_Content);
               newPost.Post_Content = Convert.ToBase64String(data);