Get text/value from textbox after value/text changed server side

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In every postback, you are always getting the old value from your database. The solution is check if the page is being rendered for the first time (!IsPostBack) then set your MainFormTemplate‘s DataSource else if is being loaded in response to a postback (IsPostBack) get the txt_Name‘s value like this:

HtmlInputText twt;

protected void Page_Load(object sender, EventArgs e)
{
      if (!IsPostBack)
      {
           using (DB_MikaDataContext data = new DB_MikaDataContext())
           { 
                MainFormTemplate.DataSource = data.File_Projects.Where(x => x.Num_Tik.Equals("12")).ToList();
                MainFormTemplate.DataBind();
           }
      }
      else 
      {
           twt = MainFormTemplate.FindControl("txt_Name") as HtmlInputText;
      }           
}

protected void btn_Update_OnClick(object sender, EventArgs e)
{
     string text = twt.Value; // You will get the new value
}

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