how can enter null (nothing) in database

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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

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3 solutions

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.

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

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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