如何获取两个日期之间的记录Asp.net

我想搜索两个日期之间的记录，但是此代码不起作用。

protected void BtnSearch_Click(object sender, EventArgs e)
{
    DataTable dt = new DataTable();
    string ToDate = txtDateTo.Text;
    string DateFrom = txtDateFrom.Text;
    dt = NewLeadClass.GetReport(ToDate, DateFrom);
}    


public static DataTable GetReport(string ToDate,string FromDate)
{
 SqlParameter[] param = new SqlParameter[]
 {
           new SqlParameter("@ToDate", ToDate),
           new SqlParameter("@FromDate",FromDate)   
       };
 DataSet ds = SqlHelper.ExecuteDataset(Utility.GetConString(), CommandType.Text, "Select * from EmpDailyReport where RecordDate <= @ToDate and RecordDate>= @FromDate",param);
    return ds.Tables[0];
}