How do I refresh dropdownlist after updating/inserting entity context

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I've a dropdownlist that after I make updates and inserts to the entity I would like to refresh to display the newly inserted contact name. Here's my code for inserting the new record:

C#

private void btnCreate_Click(object sender, EventArgs e)
        {
            var nextContact = context.Contacts.OrderBy("it.ContactID DESC").First();
            int nextContactID = nextContact.ContactID + 1;
            string[] name = txtTenant.Text.Split(' ');
            var contact = Contact.CreateContact(nextContactID, name[0].ToString(), name[1].ToString());
            var address = new Address();
            address.Address1 = txtAddress.Text;
            contact.ContactNumber = txtContactNum.Text;
            address.Mortgage = txtMortgage.Text;
            address.RemainingMortgage = txtRemainingMortgage.Text;
            address.Rent = txtRent.Text;
            address.Period = cboPeriod.SelectedIndex;
            address.RentArrears = txtRentArrears.Text;
            address.Rates = txtRates.Text;
            address.RatesUpToDate = chkRates.Checked;
            address.RentArrears = txtRentArrears.Text;
            address.Repairs = txtRepairs.Text;
            //join the new address to the contact
            address.Contact = contact;
            //add new graph to the contact
            context.AddToContacts(contact);
            context.SaveChanges();
        }

Posted 28-Jan-14 0:37am

pmcm

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Tejas Vaishnav 28-Jan-14 6:43am

where is your code to bind data to your dropdownlist can you post it

pmcm 28-Jan-14 6:48am

Here it is:
private void QueryContacts()
{
cboContactList.DataSource = context.Contacts.ToList();
cboContactList.DisplayMember = "FirstName";
cboContactList.ValueMember = "ContactID";
cboContactList.Text = "-- Please Select a Contact --";
cboContactList.Invalidate();
}

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Praveen_P · Answer 1 · 2014-01-28T01:00:00

Solution 1

After the insertion call the function QueryContacts()

Posted 28-Jan-14 1:00am

Praveen_P

Comments

pmcm 28-Jan-14 8:21am

When I do this it sets the display value of the Dropdownlist to "-- Please Select a Contact --" which is not what I want if I insert a new contact, i'd like that persons name to be the display value. How do i achieve this?

Praveen_P 28-Jan-14 23:56pm

select the last inserted ContactID from db using IDENT_CURRENT , then set cboContactList.SelectedValue to last inserted id