Sencha Touch background values

My connection is made. Net program, ask me. Net program, how to get to the variable value of ah
Sencha TouchFor example, I was a login box, how to obtain a user name and password ah. request.form and request.querystring have no corresponding value.
There is always an error I webservies.

 Ext.define ('mTrain.model.LoginModel', {
extend: 'Ext.data.Model', 
config: {
fields: ['txtUserCode', 'txtUserName', 'txtUserPwd', 'txtUserType'], 
proxy: {
type: "ajax", 
url: '/ mTrain / Home.asmx / ValUserLogin', 
reader: {
type: 'json', 
root: 'user' 
} 
} 
} 

}); 

Reply:
Brothers and sisters have not used ah
Reply:
Well ............ there is no brothers up, then points
Reply:
There are no points to pick