mjellow!

I'm doing some very simple C# code in Visual Studio, with a little SQL.
It is pretty simple;
I've got some textboxes, and want the entered to get saved in my SQL database.
Googled all day long, and cant seem to find a solution fitting me -.-
The code I go so far, which I cant understand why not will work:

status.aspx:

<form id="form1" runat="server>

  <asp:Label ID="Label1" runat="server" Text="EmployeeID:"></asp:Label>
   <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
       <asp:Label ID="Label2" runat="server" Text="FirstName:"></asp:Label>
   <asp:TextBox ID="TextBox2" runat="server"></asp:TextBox><br />
       <asp:Label ID="Label3" runat="server" Text="LastName:"></asp:Label>
   <asp:TextBox ID="TextBox3" runat="server"></asp:TextBox><br />
       <asp:Label ID="Label4" runat="server" Text="Address:"></asp:Label>
   <asp:TextBox ID="TextBox4" runat="server"></asp:TextBox><br />
       <asp:Label ID="Label5" runat="server" Text="Mobile:"></asp:Label>
   <asp:TextBox ID="TextBox5" runat="server"></asp:TextBox><br />

</form>




status.aspx.cs:

       string connection;
       connection = System.Configuration.ConfigurationManager.ConnectionStrings["mycon"].ConnectionString.ToString();
       con = new SqlConnection(connection);

   protected void btnNew_Click(object sender, EventArgs e)
   {

          SqlCommand cmd = new SqlCommand();
          string query = "INSERT INTO EMPLOYEE VALUES(@EmpID,@FirstName,@LastName,@Address,@Mobile";

              cmd.CommandText = query;

              cmd.Parameters.AddWithValue("@EmpID", TextBox1);
              cmd.Parameters.AddWithValue("@FirstName", TextBox2.Text );
              cmd.Parameters.AddWithValue("@LastName",TextBox3.Text );
              cmd.Parameters.AddWithValue("@Address",TextBox4.Text );
              cmd.Parameters.AddWithValue("@Mobile",TextBox5.Text );

              cmd.Connection = con;
              con.Open();
              cmd.ExecuteNonQuery();
              con.Close();

       } 



It gives me an error at "cmd.ExecuteNonQuery();"

Fail description:

No mapping exists from object type System.Web.UI.WebControls.TextBox to a known managed provider native type.

but why?! Hope someone can help me, before im gonna loose all my hair!