how to get command argument of link button in radiobtnlist?

i have got 4 linkbutton controls with command arguments....when the linkbutton is clicked it populates the datalist based on the command argument...

and i have a radio button list control that filters the data according to price that is populated in the datalist......

on page load,the datalist is populated with all the items....when i use rbtnlistcontrol on page load,it works as expected, but when i click any link button and then price radiobutton control,it doesn't filter the result/data.....

here's my html,

CommandArgument="1" OnClick="lbtnmenu_click">Mobile

CommandArgument="2" OnClick="lbtnmenu_click">Shoes

CommandArgument="3" OnClick="lbtnmenu_click">Bags

CommandArgument="4" OnClick="lbtnmenu_click">Clothing

RepeatLayout="Table"

onselectedindexchanged="rblbrands_SelectedIndexChanged">

AutoPostBack="True" Font-Size="1em" Width="100%"

onselectedindexchanged="rblpricerange_SelectedIndexChanged">

Rs.2000 and Below

Rs.2001-Rs.5000

Rs.5001-Rs.10000

Rs.10001-Rs.18000

Rs.18001-Rs.25000

Rs.25001-Rs.35000

Rs.35001 and Above

RepeatDirection="Horizontal" CellPadding="0" CellSpacing="0" BackColor="Aqua"

Width="100%">

border: 2px solid Blue; background-color: Green; text-align: center">

<%# Eval("Name") %>

Productid: font-weight: 500;">

<%# Eval("Productid") %>

Description

<%# Eval("Description") %>

ImageUrl:

<%# Eval("ImageUrl")%>

" width="160px" height="320px" />

Price:

<%# Eval("Price")%>

Quantity:

<%# Eval("Quantity")%>

Add To Cart

& here's my code for selectec index changed

protected void rblpricerange_SelectedIndexChanged(object sender, EventArgs e)

{

string brands = null;

if (rblbrands.Items.Cast().Any(x => x.Selected))

{

brands = rblbrands.SelectedItem.Text;

}

int price = Convert.ToInt32(rblpricerange.SelectedValue);

/*dlCustomers.DataSource = GetCustomersData(pageindex,categoryid,brands,price); */

dlCustomers.DataSource = GetCustomersData(1, 0, brands, price);

dlCustomers.DataBind();

Label1.Text = "Radio button list value : " + rblpricerange.SelectedValue;

}

thanks in advance......