after enter save button i need the data in the comboboxlist

Hello Durga  I performed an example and i did't find any problem  after insert data in table on button click you can call a method which bind the data with combobox like:

public void call()
        {
            con.Open();
            string str = "select * from pankaj";
            SqlDataAdapter da = new SqlDataAdapter(str, con);
            DataTable tab = new DataTable();
            da.Fill(tab);
            comboBox1.DataSource = tab;
            comboBox1.ValueMember = "take";
            comboBox1.DisplayMember = "take";
            con.Close();
        }
       

      

        private void pankaj(object sender, EventArgs e)
        {
            con.Open();
            string str = "insert into pankaj values('" + textBox2.Text + "')";
            SqlCommand com = new SqlCommand(str, con);
            com.ExecuteNonQuery();
            con.Close();
            call();
        }

after each click i am find new data in combobox........

yes i can save in the database and also retrieve it from the database  using search option.

example i have  customername, phone ,address like that

 if i save data using save option and i am retrieving data using search option using customername. after saving then sequentially i thought to retrieve it. only, the problem is i can retrieve, when i have given full name, but i cant get the name in combolist  sequentially. it will be there after close application then open means then only the combobox is updated with last activity either saved data or deleted data . 

you can save data into database and bind to cumbobox from database

i have done this i got it . but i am asking when executing if i  have store some data using save option then that data not in the list but if i give data it retrieved to me but not in the list  it will be there after close application again executing  then only it will update the data in the list. 




why like that why i cann't get after store why it will not update spantaneously?  after close the application then open the application means its there in the list.

bind combobox on buttonclick after insert the data into database