range expression using query extender

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.NET3.0

.NET

Cannot convert value of parameter '' from 'System.String' to 'System.DateTime'.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.InvalidOperationException: Cannot convert value of parameter '' from 'System.String' to 'System.DateTime'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[InvalidOperationException: Cannot convert value of parameter '' from 'System.String' to 'System.DateTime'.]
   System.Web.UI.WebControls.DataSourceHelper.ConvertType(Object value, Type type, String paramName) +392
   System.Web.UI.WebControls.DataSourceHelper.BuildObjectValue(Object value, Type destinationType, String paramName) +167
   System.Web.UI.WebControls.Expressions.RangeExpression.GetMinRangeExpression(Expression propertyExpression, Object value, RangeType rangeType) +46
   System.Web.UI.WebControls.Expressions.RangeExpression.GetQueryable(IQueryable source) +257
   System.Web.UI.WebControls.Expressions.QueryExpression.GetQueryable(IQueryable source) +207
   System.Web.UI.WebControls.QueryExtender.OnDataSourceQueryCreated(Object sender, QueryCreatedEventArgs e) +47
   System.Web.UI.WebControls.QueryableDataSourceView.OnQueryCreated(QueryCreatedEventArgs e) +115
   System.Web.UI.WebControls.QueryableDataSourceView.ExecuteQueryExpressions(IQueryable source, QueryContext context) +52
   System.Web.UI.WebControls.QueryableDataSourceView.ExecuteQuery(IQueryable source, QueryContext context) +21
   System.Web.UI.WebControls.LinqDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +343
   System.Web.UI.DataSourceView.Select(DataSourceSelectArguments arguments, DataSourceViewSelectCallback callback) +21
   System.Web.UI.WebControls.DataBoundControl.PerformSelect() +143
   System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +74
   System.Web.UI.WebControls.GridView.DataBind() +4
   System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +66
   System.Web.UI.WebControls.GridView.OnPreRender(EventArgs e) +26
   System.Web.UI.Control.PreRenderRecursiveInternal() +103
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Control.PreRenderRecursiveInternal() +175
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2496