public void GetBrandByCategory()
{
Object CategoryByBrandFill = new Object();
CategoryByBrandFill.Category_Name = HiddenCatagoryName.Value;
DataTable dt = BSLAYER.BrandFillByCategory(CategoryByBrandFill);
Ddlbrand.DataSource = dt;
Ddlbrand.DataTextField = "Product_Brand";
Ddlbrand.DataValueField = "Product_Brand";
Ddlbrand.DataBind();
Ddlbrand.Items.Insert(0, "--Filter By Brand--");
}