Insert null instead of blank in database

I'll go step by step. I wonder why blank gets inserted instead of null

1. This is in the model
public string MiddleName { get; set; }

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2. Database column is this
[MiddleName] [varchar](250) NULL,

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3. I don't enter anything in  the middle name field
screen
4.  I have this line of code

 var middleName = string.IsNullOrEmpty(model.MiddleName) ? (object) DBNull.Value : model.MiddleName;

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5. I see the value is null
null value
6. I see this after the line of code is executed
value of middle name
7. I call a stored proc and insert it like this. I out .ToString() because I was getting an error that Object can't be converted to string

 
  _dbContext.usp_InsertPersonali765Draft(model.ApplyReasonId, firstName, middleName.ToString(),
       ....

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8.  This is part of the stored proc

ALTER procedure [dbo].[usp_InsertPersonali765Draft]


@ApplyReasonId int,
@FirstName varbinary(max),
@MiddleName varchar(50),
.....

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9. I see blank . I want to save Null

db
LVL 8
CamilliaAsked:
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anarki_jimbelSenior DeveloperCommented:
I'd probably modify the stored procedure to insert NULL if middle name is empty.

The thing is that when you call [middleName.ToString] you get an empty string. And you insert this empty string, not NULL into a database.

Or simply try to pass 'null' to the stored procedure.
var middleName = string.IsNullOrEmpty(model.MiddleName) ? null : model.MiddleName;

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MrunalCommented:
Use - AddWithValue

Reference:

 if (value == null)
        cmd.Parameters.AddWithValue(name, DBNull.Value);
    else
        cmd.Parameters.AddWithValue(name, value);
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CamilliaAuthor Commented:
thanks, I'll try it.
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