Question

I am trying to store a null value into a DateTime column. My code is like below:

protected void btnInsert_Click(object sender, EventArgs e)
{
    try
    {
        ChangeModule cm = new ChangeModule();
        cm.CR_REF_NO = txtCRRefNumber.Text.Trim();
        cm.SLA_DELIVERY_DATE_WAIVER = DateTime.ParseExact(txtSLADeliveryDateWaiver.Text, "dd/MM/yy", null);
        else /*This else part is causing problem since I assigned null*/
             cm.SLA_DELIVERY_DATE_WAIVER = null;
    }
    catch (Exception ex)
    {
       throw ex;
    }
}

Code is working fine as long as a proper date exists in SLA_DELIVERY_DATE_WAIVER, but throwing error when there is the blank textbox.

Answer 1

It is a problem to send null values into date-parameters inside the sql server stored procedires. Hence, whenever there is a need to pass null date from front-end application, pass some min. date like ‘1/1/1753’ for example.

Inside SQL Server stored procedure, check for the null date like below:

IF DATEDIFF(DD, @DATE, '1/1/1753') = 0
    SET @DATE = NULL

Now, you can use @DATE inside SQL Server stored procedure however you like.