Ayuda con filtro combobox

[Reyscorpion]

Disculpa que te este molestando pero la verdad es que soy nuevo con el c# y es muy poco lo que entiendo aunque haber esto donde lo pongo? porque no entiendo muy bien lo que me comentas lo he metido pero me marca errores si quieres aqui te dejo como lo tengo y haber si me puedes ayudar vale? digo espero y no te moleste mi ignorancia, gracias....

System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication5
{
public partial class Form1 : Form
{

public Form1()
{
InitializeComponent();
}

private void label3_Click(object sender, EventArgs e)
{

}

private void label4_Click(object sender, EventArgs e)
{

}

private void label8_Click(object sender, EventArgs e)
{

}

private void comboBox8_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbtie.Enabled = true;
this.cmbherr.Enabled = true;

}

private void comboBox3_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbrep.Enabled = true;
this.cmbent.Enabled = true;
}

private void Form1_Load(object sender, EventArgs e)
{
this.cmblin.Items.Add("Acabados");
this.cmblin.Items.Add("Adhesivos");
this.cmblin.Items.Add("Bob-Grande");
this.cmblin.Items.Add("Bob-Chica");
this.cmblin.Items.Add("Brodbeck");
this.cmblin.Items.Add("C-65");
this.cmblin.Items.Add("E-2");
this.cmblin.Items.Add("E-17");
this.cmblin.Items.Add("E-43");
this.cmblin.Items.Add("E-48");
this.cmblin.Items.Add("Embarques");
this.cmblin.Items.Add("Flejadora-1");
this.cmblin.Items.Add("Flejadora-2");
this.cmblin.Items.Add("Impresora-1");
this.cmblin.Items.Add("Impresora-2");
this.cmblin.Items.Add("IPD");
this.cmblin.Items.Add("J-1");
this.cmblin.Items.Add("J-2");
this.cmblin.Items.Add("J-3");
this.cmblin.Items.Add("L-1");
this.cmblin.Items.Add("L-2");
this.cmblin.Items.Add("L-3");
this.cmblin.Items.Add("Lhomme");
this.cmblin.Items.Add("Manufacturas");
this.cmblin.Items.Add("Paco-1");
this.cmblin.Items.Add("Paco-2");
this.cmblin.Items.Add("Shelfton");
this.cmblin.Items.Add("Tureti");
this.cmbequ.Items.Add("Creel");
this.cmbequ.Items.Add("Adhesivos");
this.cmbequ.Items.Add("Conveyor");
this.cmbequ.Items.Add("Tina dextrina");
this.cmbequ.Items.Add("Sierra");
this.cmbequ.Items.Add("Mandril");
this.cmbequ.Items.Add("Groover-1");
this.cmbequ.Items.Add("Groover-2");
this.cmbequ.Items.Add("Groover-3");
this.cmbtie.Items.Add("0");
this.cmbtie.Items.Add("5");
this.cmbtie.Items.Add("10");
this.cmbherr.Items.Add("0");
this.cmbherr.Items.Add("10");
this.cmbrep.Items.Add("0");
this.cmbrep.Items.Add("15");
this.cmbrep.Items.Add("30");
this.cmbent.Items.Add("0");
this.cmbent.Items.Add("10");
this.cmblim.Items.Add("0");
this.cmblim.Items.Add("10");
this.cmbhrs.Items.Add("0");
this.cmbhrs.Items.Add("30");
this.cmbmcp.Items.Add("MC");
this.cmbmcp.Items.Add("MP");
this.cmbmes.Items.Add("Enero");
this.cmbmes.Items.Add("Febrero");
this.cmbmes.Items.Add("Marzo");
this.cmbmes.Items.Add("Abril");
this.cmbmes.Items.Add("Mayo");
this.cmbmes.Items.Add("Junio");
this.cmbmes.Items.Add("Julio");
this.cmbmes.Items.Add("Agosto");
this.cmbmes.Items.Add("Septiembre");
this.cmbmes.Items.Add("Ooctubre");
this.cmbmes.Items.Add("Noviembre");
this.cmbmes.Items.Add("Diciembre");
this.cmbtur.Items.Add("1º");
this.cmbtur.Items.Add("2º");
this.cmbtur.Items.Add("3º");
this.cmbmec.Items.Add("Adalberto R.");
this.cmbmec.Items.Add("Diego O.");
this.cmbmec.Items.Add("German G.");
this.cmbmec.Items.Add("Gilberto R.");
this.cmbmec.Items.Add("José B.");
this.cmbmec.Items.Add("Marcelino H.");
this.cmbmec.Items.Add("Moises L.");
this.cmbmec.Items.Add("Raúl A.");
this.cmbmec.Items.Add("Rogelio U.");
this.cmbmec.Items.Add("Serafín N.");
this.cmbmec.Items.Add("Victor A.");
this.cmblin.Enabled = true;
this.cmbequ.Enabled = false;
this.txtsub.Enabled = false;
this.txtdec.Enabled = false;
this.txtref.Enabled = false;
this.cmbtie.Enabled = false;
this.cmbherr.Enabled = false;
this.cmbrep.Enabled = false;
this.cmbent.Enabled = false;
this.cmblim.Enabled = false;
this.cmbhrs.Enabled = false;
this.cmbmcp.Enabled = false;
this.txtfec.Enabled = false;
this.txttie.Enabled = false;
this.txthor.Enabled = false;
this.cmbtur.Enabled = false;
this.cmbmes.Enabled = false;
this.cmbmec.Enabled = false;
this.btnenv.Enabled = false;

}

private void cmbequ_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbequ.Enabled = true;
this.txtsub.Enabled = true;
//this.cmblin = TextBoxBase;


}

private void cmblin_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmblin.Enabled = true;
this.cmbequ.Enabled = true;
}

private void label1_Click(object sender, EventArgs e)
{

}

private void txtsub_TextChanged(object sender, EventArgs e)
{
this.txtsub.Enabled = true;
this.txtdec.Enabled = true;

}

private void txtdec_TextChanged(object sender, EventArgs e)
{
this.txtdec.Enabled = true;
this.txtref.Enabled = true;

}

private void txtref_TextChanged(object sender, EventArgs e)
{
this.txtref.Enabled = true;
this.cmbtie.Enabled = true;
}

private void cmbherr_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbherr.Enabled = true;
this.cmbrep.Enabled = true;

}

private void cmbent_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbent.Enabled = true;
this.cmblim.Enabled = true;
}

private void cmblim_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmblim.Enabled = true;
this.cmbhrs.Enabled = true;
}

private void cmbhrs_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbhrs.Enabled = true;
this.cmbmcp.Enabled = true;
//txttot = cmbtie.Text + cmbherr.Text + cmbrep.Text + cmbent.Text + cmblim.Text + cmbhrs.Text;

}

private void cmbmcp_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbmcp.Enabled = true;
this.txtfec.Enabled = true;
}

private void txtfec_TextChanged(object sender, EventArgs e)
{
this.txtfec.Enabled = true;
this.txttie.Enabled = true;
}

private void cmbtur_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbtur.Enabled = true;
this.cmbmes.Enabled = true;
}

private void cmbmes_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbmes.Enabled = true;
this.cmbmec.Enabled = true;
}

private void cmbmec_SelectedIndexChanged(object sender, EventArgs e)
{
this.cmbmec.Enabled = true;
this.btnenv.Enabled = true;
}

private void txtfec_TextChanged_1(object sender, EventArgs e)
{

}

private void textBox1_TextChanged(object sender, EventArgs e)
{
this.txthor.Enabled = true;
this.cmbtur.Enabled = true;
}

private void button1_Click(object sender, EventArgs e)
{
Application.Exit();
}

private void timer1_Tick(object sender, EventArgs e)
{

}

private void txtfec_ValueChanged(object sender, EventArgs e)
{
this.txtfec.Enabled = true;//dateTimePicker1
this.txttie.Enabled = true;
}

private void txthor_MaskInputRejected(object sender, MaskInputRejectedEventArgs e)
{
this.txthor.Enabled = true;
this.cmbtur.Enabled = true;
}

private void txttie_MaskInputRejected_1(object sender, MaskInputRejectedEventArgs e)
{
this.txttie.Enabled = true;
this.txthor.Enabled = true;
}

private void monthCalendar1_DateChanged(object sender, DateRangeEventArgs e)
{

}

}