writing null values to the database column of datetime type in C#

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I have a database MS 2007 with various data types of columns. I am binding this database to a datatable in C#. i want to write data from a textbox to a particular column in the main database whose type is date time . the difficulty is that every time I have to enter a valid datetime value in the text box column before writing it to the database. if it do not have a valid datetime it create error.

what i want is that i should be able to write to the database column from the textbox even when the value of text box is null. i dont want to keep any default value in the datetime column of database when the text box is null.

I use the following code

C#

Projects.dt.Rows[j]["DATERECEIVED"] = txtDTR.Text;
Projects.dt.Rows[j]["DATEDISPATCHED"] = txtDTD.Text;

                    Projects.da = new OleDbDataAdapter(Projects.cmdstring, Projects.connection);
                    Projects.cmdb = new OleDbCommandBuilder(Projects.da);                    
                    Projects.da.Fill(Projects.dt);
                    Projects.dt.GetChanges();

                    DialogResult result;
                    result = MessageBox.Show("Do you Want To Save ", "", MessageBoxButtons.YesNo);
                    if (result == DialogResult.Yes)
                    {

                        if (Projects.dt.GetChanges() != null)
                        {

                            Projects.da.Update(Projects.dt);
                            Projects.connection.Close();

                        }
                        Projects.dt.AcceptChanges();
                    }

thanks in advance

Posted 25-Oct-11 22:06pm

MohammadIqbal

Updated 25-Oct-11 22:10pm

Mehdi Gholam

v2

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RaisKazi · Answer 1 · 2011-10-25T22:20:00

Solution 1

Use DBNull.Value.

Try as below code.

C#

if (string.IsNullOrEmpty(txtDTR.Text))
{

  Projects.dt.Rows[j]["DATERECEIVED"] = DBNull.Value;
}
else
{
  Projects.dt.Rows[j]["DATERECEIVED"] = txtDTR.Text;
}

if (string.IsNullOrEmpty(txtDTD.Text))
{
  Projects.dt.Rows[j]["DATEDISPATCHED"] = DBNull.Value;
}
else
{

  Projects.dt.Rows[j]["DATEDISPATCHED"] = txtDTD.Text;
}

Posted 25-Oct-11 22:20pm

RaisKazi

Comments

[no name] 26-Oct-11 4:27am

thanks it works

RaisKazi 26-Oct-11 4:32am

Perfect.! Please do not forget to "Accept Answer", so that it can be a reference solution for some one else.

Mehdi Gholam 26-Oct-11 4:34am

my 5!

RaisKazi 26-Oct-11 4:34am

Thank you Mehdi. :)

Member 10920951 6-Jan-16 9:37am

RaisKazi,
The Answer you posted above is not working.

RaisKazi 6-Jan-16 10:14am

Whats not working? And whats the issue u facing?