how can i make Date field insert Null into the database?

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SQL-Server-2008

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Hi.

i have written an insert statement In VS2010 , in one of textbox which is for BirthDate , i have assigned Date type for it in SQlserver 2008r2,
and my code(parameter input) for that field is in below:

C#

cmd.Parameters.Add("@BirthDate_M", SqlDbType.Date).Value = Convert.ToDateTime(BirthDateTextBoxMilad.Text);

whenever i don't write any date inside textbox this exception appears:
String was not recognized as a valid DateTime.

while i want that whenever i don't write anything in textbox , Null to be inserted into the Database, so i wrote this code:

C#

cmd.Parameters.Add("@BirthDate_M", SqlDbType.Date).Value = null;

but if i do this , another exception will appear:
The parameterized query '(@FirstName nvarchar(5),@LastName nvarchar(5),@FatherName nvarch' expects the parameter '@BirthDate_M', which was not supplied.

which indicate that i have to insert a date.how can i prevent this happens and make it insert Null into the database.

Posted 3-Aug-12 20:37pm

mohammad ehsan

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3 solutions

Solution 2

Hi,
Try this:

C#

DateTime? value = Convert.ToDateTime(BirthDateTextBoxMilad.Text);
if (value.HasValue)
{
    cmd.Parameters.Add("@BirthDate_M", SqlDbType.Date).Value = value;
}

--Amit

Posted 3-Aug-12 20:50pm

_Amy

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*Karthik Harve* · Accepted Answer · 2012-08-03T20:48:00

Solution 1

hi,

try this,

C#

cmd.Parameters.Add("@BirthDate_M", SqlDbType.Date).Value = (BirthDateTextBoxMilad.Text.Trim()==string.empty) ? DbNull.value : Convert.ToDateTime(BirthDateTextBoxMilad.Text.Trim());

hope it works

Posted 3-Aug-12 20:48pm

Karthik Harve

Santhosh Kumar Jayaraman · Accepted Answer · 2012-08-03T20:50:00

Solution 3

try this

C#

cmd.Parameters.Add("@BirthDate_M", SqlDbType.Date).Value = DBNull.Value;

Posted 3-Aug-12 20:50pm

Santhosh Kumar Jayaraman