Passing null value into database using storedprocedure

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cmd.Parameters.AddWithValue("@FIRST_NAME", string.IsNullOrWhiteSpace(FIRST_NAME) ? DBNull.Value : FIRST_NAME);

Error:
no implicit conversion between 'system.dbnull' and 'string'

Posted 21-Oct-13 3:17am

sathish kumar

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2 solutions

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hypermellow · Accepted Answer · 2013-10-21T03:30:00

Solution 2

... or if it's a DBNull.Value you need (instead of the null value solution above), try:

C#

cmd.Parameters.AddWithValue("@FIRST_NAME", string.IsNullOrWhiteSpace(FIRST_NAME) ? (object)DBNull.Value : (object)FIRST_NAME);

The conversion to (object) avoids the "no implicit conversion between 'system.dbnull' and 'string'" exception.

Posted 21-Oct-13 3:30am

hypermellow

Comments

sathish kumar 21-Oct-13 9:40am

The one you mentioned is working it inserting null value into database, but my problem is it's insert null value to at all times.

It must check the textbox and should enter null only when it is empty

hypermellow 21-Oct-13 9:45am

Ok, try this (assuming your textbox is called txtFIRSTNAME):

cmd.Parameters.AddWithValue("@FIRST_NAME", (string.IsNullOrWhiteSpace(txtFIRSTNAME.Text)) ? (object)DBNull.Value : (object)txtFIRSTNAME.Text);

Amol_B · Accepted Answer · 2013-10-21T03:25:00

Solution 1

Try this

cmd.Parameters.AddWithValue("@FIRST_NAME", string.IsNullOrWhiteSpace(FIRST_NAME) ? DBNull.Value : FIRST_NAME);

Posted 21-Oct-13 3:25am

Amol_B

Updated 21-Oct-13 4:03am

v2

Comments

sathish kumar 21-Oct-13 9:43am

Sorry, I got this error

INSERT_NEW_STARTER_DETAILS' expects parameter '@FIRST_NAME', which was not supplied.

Ranjan.D 21-Oct-13 10:14am

Could you verify the column is NULLable in database table ? Just a second quick check.