How to insert null value in datatime field in c#

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How to insert null value in datetime field in sql/access database???

DataBase : Db_Xyz
Table: Tb_Abc
Col1(Varchar)
Col2(Int)
Col3(datetime)

Query:- insert into Tb_Abc(Col1,Col2,Col3)values('" + txtvalue1 + "','" + txtvalue2 + "','" + txtvalue3 + "'

Note:- Without using Parameter...

Help me...

Posted 20-May-14 5:56am

Manamohan Jha

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OriginalGriff · Answer 1 · 2014-05-20T06:01:00

Solution 1

Try:

SQL

INSERT INTO Tb_Abc(Col1,Col2,Col3) VALUES ('" + txtvalue1 + "','" + txtvalue2 + "',NULL)

But please, don't do it like that! Do not concatenate strings to build a SQL command. It leaves you wide open to accidental or deliberate SQL Injection attack which can destroy your entire database. Use Parametrized queries instead.

Posted 20-May-14 6:01am

OriginalGriff

Comments

Manamohan Jha 20-May-14 12:08pm

I am using this query in my windows application
how to set textbox in Null place???

OriginalGriff 20-May-14 12:18pm

Use a parameterized query, and check the textbox content. If it's empty, then set the parameter value to DBNull.Value

PIEBALDconsult 20-May-14 12:23pm

You could try a CASE to test for empty. But, really, use parameters.