Dropdownlist selected Item load to second dropdown list from stored procedure But i'm not getting to from sp.Please help me urgently

<table align="center">
<tr>
<td><asp:Label ID="lblmake" runat="server" Text="MAKE"></asp:Label>
</td>
<td><asp:DropDownList ID="ddlMake" Height="20px" Width="300px"
AutoPostBack="True" onselectedindexchanged="ddlMake_SelectedIndexChanged1" runat="server">

</asp:DropDownList>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblRateKW" runat="server" Text="RATING IN KW"></asp:Label>
</td>
<td>
<asp:DropDownList ID="ddlkw" runat="server" Width="300px" AutoPostBack="True">

</asp:DropDownList>
</td>
</tr>
<tr>
<td>
<asp:Label ID="lblNOP" runat="server" Text="NO OF POLES"></asp:Label>  </td>
<td>
<asp:DropDownList ID="ddlNoOfPoles" runat="server" Width="300px">

</asp:DropDownList>
</td>
</tr>

public partial class DropDownUpdate : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            func1();
            func2();
        }
    }
    protected void ddlMake_SelectedIndexChanged1(object sender, EventArgs e)
    {
        string a = ddlMake.SelectedValue;
        func2();
    }
    private void func1()
    {
        SqlConnection con = new SqlConnection("Data Source=192.168.8.122 ;Initial Catalog=SAPDATA;User ID=sp;Password=sp");
        SqlDataAdapter com = new SqlDataAdapter("DP_spA01_Other", con);
        com.SelectCommand.CommandType = CommandType.StoredProcedure;
        DataSet ds = new DataSet();
        if (com != null)
        { com.Fill(ds); }
        ddlMake.DataSource = ds;
        ddlMake.DataTextField = "sMake";
        ddlMake.DataValueField = "sSql1";
        ddlMake.DataBind();
    }
    private void func2()
    {
        SqlConnection con = new SqlConnection("Data Source=192.168.8.122 ;Initial Catalog=SAPDATA;User ID=sp;Password=sp");
        SqlDataAdapter com1 = new SqlDataAdapter("sKw", con);
        com1.SelectCommand.CommandType = CommandType.StoredProcedure;
        com1.SelectCommand.Parameters.AddWithValue("@sKw", ddlkw.SelectedValue);
        DataSet ds1 = new DataSet();
        if (com1 != null)
        { com1.Fill(ds1); }
        ddlkw.DataSource = ds1;
        ddlkw.DataTextField = "sKw";
        ddlkw.DataValueField = "sSql1";
        ddlkw.DataBind();
    }
}

Create PROCEDURE  [dbo].[DP_spA01_Other](
	@sSql1 varchar(20),@sMake varchar(1),@sKw varchar(2) ,
	@sFrame varchar(2),@sPoles varchar(4) ,@sMount varchar(4),
	@sInsu varchar(4),@sEnclose varchar(4),@sVolt varchar(4),
	@sFreq varchar(4),@sMKw varchar(15)) 
AS
	if @sSql1="Make"
		select code,PRODESC from a01_d order by code
	if @sSql1="Kw"
		Select distinct(a.code),a.PRODESC,a.kw from a01_ef a ,DP_a01 b 
		where substring(b.accode,5,2)=a.code and substring(b.accode,4,1) = @sMake  order by a.kw
	if @sSql1="Poles"
		Select distinct(a.code),a.PRODESC from a01_g a ,DP_a01 b 
		where substring(b.accode,7,1)=a.code and substring(b.accode,4,1) = @sMake and substring(b.accode,5,2)=@sKw
	If @sSql1="Mounting"
		Select distinct(a.code),a.PRODESC from a01_h a ,DP_a01 b 
		where substring(b.accode,8,1)=a.code and substring(b.accode,4,1) = @sMake and substring(b.accode,5,2)=@sKw   
		and substring(b.accode,7,1)=@sPoles