高手请帮忙　着急！！～System.Data.SqlClient.SqlException: 从数据类型 nvarchar 转换为 numeric 时出错。

代码片段：private Dictionary<decimal, decimal> m_ht;
protected void Page_Load(object sender, EventArgs e)
{
if (Application["Box"] != null)
{
m_ht = Application["Box"] as Dictionary<decimal, decimal>;
string strClientIDs = "";
if (m_ht != null && m_ht.Count > 0)
{
foreach (decimal decClientID in m_ht.Keys)
{
if (!StringUtil.IsEmpty(strClientIDs)) strClientIDs += ",";
strClientIDs += decClientID;
}
txtClientIDs.Value = strClientIDs;

}
}
}
结果报错：从数据类型 nvarchar 转换为 numeric 时出错。
说明: 执行当前 Web 请求期间，出现未处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.Data.SqlClient.SqlException: 从数据类型 nvarchar 转换为 numeric 时出错。

源错误:

执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪信息确定有关异常原因和发生位置的信息。

堆栈跟踪:


[SqlException (0x80131904): 从数据类型 nvarchar 转换为 numeric 时出错。]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +177
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +68
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +199
System.Data.SqlClient.TdsParser.Run(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj) +2305
System.Data.SqlClient.SqlDataReader.HasMoreRows() +154
System.Data.SqlClient.SqlDataReader.ReadInternal(Boolean setTimeout) +211
System.Data.SqlClient.SqlDataReader.Read() +9
System.Data.Common.DataAdapter.FillLoadDataRow(SchemaMapping mapping) +176
System.Data.Common.DataAdapter.FillFromReader(DataSet dataset, DataTable datatable, String srcTable, DataReaderContainer dataReader, Int32 startRecord, Int32 maxRecords, DataColumn parentChapterColumn, Object parentChapterValue) +176
System.Data.Common.DataAdapter.Fill(DataSet dataSet, String srcTable, IDataReader dataReader, Int32 startRecord, Int32 maxRecords) +195
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +199
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +140
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +83
System.Web.UI.WebControls.SqlDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +1663
System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +13
System.Web.UI.WebControls.DataBoundControl.PerformSelect() +140
System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +68
System.Web.UI.WebControls.GridView.DataBind() +5
System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +61
System.Web.UI.WebControls.CompositeDataBoundControl.CreateChildControls() +67
System.Web.UI.Control.EnsureChildControls() +97
System.Web.UI.Control.PreRenderRecursiveInternal() +50
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Control.PreRenderRecursiveInternal() +171
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5729


请各位帮忙解决下　谢谢