Problem with order date in database C#

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i have database by access and i make my code for add data for employee the problem
i have data but not complete for each employee so i want take textbox empty

i mean

i want add data like ID and Date for start work and Date for Stop work
so i have now ID and i have Start work but not have stop work because he is not stop

when i leave textbox for stop work empty will give me error
because type of data in database Date so not allow leave it empty

when i let type for stop work in database with string
this give me allow leave textbox with empty when i insert data

but

when i load data
i can't order data because the type is string not date

can anyone help me please

What I have tried:

i have 3 column (ID, start work, stop work)
can't leave stop work textbox empty because type is date in database
any solution can let textbox with empty?

Posted 7-Dec-21 23:01pm

ZaYeD1

Updated 10-Dec-21 21:42pm

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CHill60 · Accepted Answer · 2021-12-07T23:07:00

In your Access database right-click on your table and select "Design View"
Click on the stop work (please tell me that is not really the name of your column - get rid of the space)
At the bottom on the screen you should see the properties for that column.
In the General tab, make sure the value for "Required" is set to "No"

EDIT after OP Comment.

Your code is vulnerable to SQL Injection - never use string concatenation to build SQL strings especially if based on user input. Use Parameterised Queries. See SQL Injection | OWASP[^] and SQL Injection Prevention - OWASP Cheat Sheet Series[^]

The reason you are getting errors is because you are always trying to insert the StopWork column. Just omit that column if the text box is blank e.g. (warning code is untested)

C#

OleDbCommand cmd = new OleDbCommand();
cmd.Connection = connection;

// These parameters always required
cmd.Parameters.AddWithValue("InvoiceNo", txtInvoiceNo.Text);
cmd.Parameters.AddWithValue("ID", txtID.Text);
cmd.Parameters.AddWithValue("ShortName", txtShortName.Text);
cmd.Parameters.AddWithValue("EnterDate", txtEnterToSaudi.Text);
cmd.Parameters.AddWithValue("StartWork", txtStartWork.Text);

string ssql; 
if(txtStopWork.Text.Length > 0)
{
	ssql = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,EnterDate,StartWork,StopWork) values (?,?,?,?,?,?)";
	// this parameter only required if StopWork textbox is not empty
	cmd.Parameters.AddWithValue("StopWork", txtStopWork.Text);
}
else
{
	// note there is one fewer ? marks
	ssql = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,EnterDate,StartWork) values (?,?,?,?,?)";
}

cmd.CommandText = ssql;

connection.Open();
cmd.ExecuteNonQuery();
connection.Close();
MessageBox.Show("Saved Done for " + txtID.Text);

ZaYeD1 · Accepted Answer · 2021-12-10T21:42:00

C#

<pre>
                OleDbCommand cmd = new OleDbCommand();
                cmd.Connection = connection;


                //txtEnterToSaudi.Text == ""
                if (txtEnterToSaudi.Text == "" && txtStartWorkDate.Text != "" && txtStopWork.Text != "")
                {
                    cmd.CommandText = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,StartWork,StopWork) values ('" + txtInvoiceNo.Text + "','" + txtID.Text + "','" + txtShortName.Text + "','" + txtStartWorkDate.Text + "','" + txtStopWork.Text + "')";
                }
                //txtStartWorkDate.Text == ""
                else if (txtEnterToSaudi.Text != "" && txtStartWorkDate.Text == "" && txtStopWork.Text != "")
                {
                    cmd.CommandText = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,EnterDate,StopWork) values ('" + txtInvoiceNo.Text + "','" + txtID.Text + "','" + txtShortName.Text + "','" + txtEnterToSaudi.Text + "','" + txtStopWork.Text + "')";
                }
                //txtStopWork.Text == ""
                else if (txtEnterToSaudi.Text != "" && txtStartWorkDate.Text != "" && txtStopWork.Text == "")
                {
                    cmd.CommandText = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,EnterDate,StartWork) values ('" + txtInvoiceNo.Text + "','" + txtID.Text + "','" + txtShortName.Text + "','" + txtEnterToSaudi.Text + "','" + txtStartWorkDate.Text + "')";
                }
                //txtEnterToSaudi.Text == "" && txtStartWorkDate.Text == ""
                else if (txtEnterToSaudi.Text == "" && txtStartWorkDate.Text == "" && txtStopWork.Text != "")
                {
                    cmd.CommandText = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,StopWork) values ('" + txtInvoiceNo.Text + "','" + txtID.Text + "','" + txtShortName.Text + "','" + txtStopWork.Text + "')";
                }
                //txtStartWorkDate.Text == "" && txtStopWork.Text == ""
                else if (txtEnterToSaudi.Text != "" && txtStartWorkDate.Text == "" && txtStopWork.Text == "")
                {
                    cmd.CommandText = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,EnterDate) values ('" + txtInvoiceNo.Text + "','" + txtID.Text + "','" + txtShortName.Text + "','" + txtEnterToSaudi.Text + "')";
                }
                //txtEnterToSaudi.Text == "" && txtStopWork.Text == ""
                else if (txtEnterToSaudi.Text == "" && txtStartWorkDate.Text != "" && txtStopWork.Text == "")
                {
                    cmd.CommandText = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,StartWork) values ('" + txtInvoiceNo.Text + "','" + txtID.Text + "','" + txtShortName.Text + "','" + txtStartWorkDate.Text + "')";
                }
                //txtEnterToSaudi.Text == "" && txtStartWorkDate.Text == "" && txtStopWork.Text == ""
                else if (txtEnterToSaudi.Text == "" && txtStartWorkDate.Text == "" && txtStopWork.Text == "")
                {
                    MessageBox.Show("please fill all data before press add");
                }
                //txtEnterToSaudi.Text != "" && txtStartWorkDate.Text != "" && txtStopWork.Text != ""
                else
                {
                    cmd.CommandText = "insert into Start_Stop_Work (InvoiceNo,ID,ShortName,EnterDate,StartWork,StopWork) values ('" + txtInvoiceNo.Text + "','" + txtID.Text + "','" + txtShortName.Text + "','" + txtEnterToSaudi.Text + "','" + txtStartWorkDate.Text + "','" + txtStopWork.Text + "')";
                }


                connection.Open();
                cmd.ExecuteNonQuery();
                connection.Close();
                MessageBox.Show("Saved Done for " + txtID.Text);

Problem with order date in database C#

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