why this message??? But every thing sound correct!

Hi!

I wrote these codes to make filter from my textbox.... At the same time we can observ records be filtered inside of the datagrid. unfortunatly I receive this message Cannot implicitly convert type 'System.Data.CommandType' to 'string'

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

using System.Data.SqlClient;

namespace WindowsFormsApplication1

{

public partial class Form1 : Form

{

SqlConnection con = new SqlConnection(@"Data Source=localhost\\sqlexpress;Initial Catalog=master;Integrated Security=True");

public Form1()

{

InitializeComponent();

}

private void textBox1_KeyUp(object sender, KeyEventArgs e)

{

con.Open();

SqlCommand cmd = con.CreateCommand();

cmd.CommandText = CommandType.Text; // the bug it's here

cmd.CommandText = "select * from consultoria where produto like ('"+textBox1.Text+"%')";

cmd.ExecuteNonQuery();

DataTable dt = new DataTable();

SqlDataAdapter da = new SqlDataAdapter(cmd);

da.Fill(dt);

con.Close();

dataGridView1.DataSource = dt;

}