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if (((string)((ComboBoxItem)cmbField.SelectedItem).Value).Equals("System.DateTime"))
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                    if (checkBox1.Checked == true)
                    {
                        value = "#" + cmbValue.SelectedItem.ToString().Trim() + "#";
                    }
}


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2.Nullable<DateTime> optime = DBNull.Value; ´«Èëoptime(¿ªÊ¼ÍøÉÏÕҵĴð°¸ÊÇNullable<DateTime> optime = null·¢ÏÖ»¹Êǻᱨ´í) ......

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asp.netc#AccessͨÓÃÊý¾Ý·ÃÎÊÀà

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;
/// <summary>
/// Data ......
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