linq to sql 多条件组合查询

linq to sql 我这里查询tbdesk表内的记录 DeskTypeID和Name是条件

    private void bind()
    {
        using (cpDataContext cp = new cpDataContext())
        {
            Expression<Func<tbDesk, bool>> expr = n => getc(n);
            var xquery = cp.tbDesk.Where<tbDesk>(expr.Compile());
            this.GridView1.DataSource= xquery;
            GridView1.DataBind();
        }
    }
    private bool getc(tbDesk tb) 
    {
        //加等于true 或等于false
        bool rst = false;
        rst |= string.IsNullOrEmpty(TextBox1.Text.Trim()) ? false : tb.DeskTypeID.Equals(int.Parse(TextBox1.Text.Trim()));
        rst |= string.IsNullOrEmpty(TextBox2.Text.Trim()) ? false : tb.Name.Contains(TextBox2.Text.Trim());
        return rst;

       //注释的这部分内容为多条件and的时候
        //bool rst = true;
        //rst |= string.IsNullOrEmpty(TextBox1.Text.Trim()) ? true : tb.DeskTypeID.Equals(int.Parse(TextBox1.Text.Trim()));
        //rst |= string.IsNullOrEmpty(TextBox2.Text.Trim()) ? true : tb.Name.Contains(TextBox2.Text.Trim());
        //return rst;
    }