protected void BindAllField(DropDownList ddl)
 {
     college        = new College();
     ddl.DataSource = college.GetAllField();
     ddl.DataBind();
     ddl.DataTextField  = "FieldTitle";
     ddl.DataValueField = "FieldID";
     ddl.DataBind();
 }
 protected void BindSubject()
 {
     college = new College();
     ddl_Subject.DataSource = college.GetAllField();
     ddl_Subject.DataBind();
     ddl_Subject.DataTextField  = "FieldTitle";
     ddl_Subject.DataValueField = "FieldID";
     ddl_Subject.DataBind();
 }