how can enter null (nothing) in database

Question

0.00/5 (No votes)

See more:

if our textbox is empty the how can we store null or nothing in database

C#

if (MyTextBox.Text == String.Empty)
{
   // the textbox is empty
   cmd.Parameters.Add("@per_m", SqlDbType.Float).Value =    ;

}

Posted 6-Mar-11 2:38am

Shagun Bansal

Updated 6-Mar-11 5:42am

thatraja

v2

Add a Solution

3 solutions

Solution 3

Try

<code>
cmd.Parameters.AddWithValue("@per_m", MyTextBox.Text.Trim() == String.Empty ? DBNull.Value : (object)MyTextBox.Text);
</code>

Posted 6-Mar-11 13:18pm

Sreejith Gopinathan

Solution 2

http://msdn.microsoft.com/en-us/library/system.dbnull.aspx[^]

I hope the above information will be helpful. If you have more concerns, please let me know.

Posted 6-Mar-11 2:45am

Monjurul Habib

Comments

Sergey Alexandrovich Kryukov 6-Mar-11 13:54pm

Sure, a 5 -- should be enough.
--SA

Monjurul Habib 7-Mar-11 1:54am

thanx for your appreciation.

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2011-03-06T02:43:00

Solution 1

Try:

cmd.Parameters.Add("@per_m", SqlDbType.Float).Value = System.DBNull.Value;

Posted 6-Mar-11 2:43am

OriginalGriff

Comments

Shagun Bansal 6-Mar-11 8:51am

cmd.Parameters.Add("@per_m", SqlDbType.Float).Value = System.DBNull.Value;
Failed to convert parameter value from a String to a Double.
this error comes

Sergey Alexandrovich Kryukov 6-Mar-11 13:54pm

Good, a 5.
--SA