How to allow textbox to save text after finish typing

If its Windows application
then you can use the Textbox Leave Event.

check this sample.The leave event will be trigger only the focus is out of the Textbix control.For example in the text box you can do typing and In Tab Click or other controls click in form the  Textbox Leave event will trigger.In that event you can call your save function.

 private void textBox1_Leave(object sender, EventArgs e)
        {
            MessageBox.Show("iam leaving save now");
        }

I suggest you make use of Javascript and server side langauge both.


create serversid method like this , in your aspx.cs file

public void Page_Load
{
 if (!Page.IsPostBack)
 {
  txtId1.Attributes.Add("onblur", "javascript:Callme('" + txtId1.ClientID + "')");

 }
}

[WebMethod()]
public static void MyMethod(string param)
{
   try { //Do here server event }
  catch (Exception) { throw; }
}

than in the aspx page