void btnChangeTrailerType_Click(object sender, EventArgs e)
{
List <int> instructionIDs = new List <int>();
foreach (Entities.Instruction instruction in this.Instrutions)
{
instructionIDs.Add(instruction.InstructionID);
}
Facade.IInstruction facInstruction = new Facade.Instruction();
facInstruction.AssignPlanningCategory(instructionIDs, this.JobID, int.Parse(cboType.SelectedValue), DateTime.Now, Page.User.Identity.Name);
this.ReturnValue = "changetrailertype";
this.Close();
}