Getting url parameter from JSON store from EXTJS ComboBox

I have a problem getting parameters from JSON store url section for combo box in EXTJS from my code by page in C #. Below is the code in the store:

var ColorStore = new Ext.data.JsonStore({
    autoLoad: true,
    url: '/proxies/ReturnJSON.aspx?view=rm_colour_view',
    root: 'Rows',
    fields: ['company', 'raw_mat_col_code', 'raw_mat_col_desc']
});

      

        
        
        
      

    

And the following code is in my code behind the page:

protected void Page_Load(object sender, EventArgs e)
{
    string jSonString = "";
    connectionClass.connClass func = new connectionClass.connClass();
    DataTable dt = func.getDataTable("sELECT * from rm_colour_view");
    //Response.Write(Request.QueryString["view"]);
    string w = Request.Params.Get("url");
    string z = Request.Params.Get("view");
    string x = Request.Params.Get("view=");
    string c = Request.Params.Get("?view");
    string s = Request.QueryString.Get("view");
    string d = Request.Params["?view="];
    string f = Request.Form["ColorStore"];
    jSonString = Serialize(dt);
    Response.Write(jSonString);
}

      

        
        
        
      

    

The line w

has the following output:

/proxies/ReturnJSON.aspx

but all other lines return null

.

How do I get rm_colour_view

from the data store?