ListViewByQuery Filter HTML

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C#

WebParts

SharePoint2010

Hello, I am developing a Web Part that filters a ListViewByQuery through the HTML form.
3 textbox;
5 listBox (multiple selections);

I wonder how I do to make the filter without doing CAML query?

SPContext.Current.Web.Lists SPList list = ["Issues"];
MyCustomView.List = list;
string query = null;
 
SPQuery qry = new SPQuery (list.DefaultView);
qry.Query =?;
qry.RowLimit = 30;
MyCustomView.Query = qry;