Server Error in '/' Application.

Public member 'replace' on type 'DBNull' not found.

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.MissingMemberException: Public member 'replace' on type 'DBNull' not found.

Source Error:


Line 88: 						<span><a class="left" href="#"><i class="fa fa-eye"></i> نام استاد : <%# Eval("Nameostad")%></a>تعداد وی سی دی : <a><%# Eval("Tedad") %></a>تعداد دی وی دی : <a href="#"><%# Eval("tedaddvd") %></a><a class="left" href="#"><i class="fa fa-comment"></i> قیمت : <%# Eval("Gheymat") %></a> </span>
Line 89: 						<p class="para">توضیحات تکمیلی این درس به شرح زیر می باشند : <br /><br /><%# Eval("tozihat") %></p><br /><br /><br /><br /><br />
Line 90:                         <p class="para">فصول این درس به شرح زیر می باشند : <br /><br /><%# Eval("fosol").replace(vbCrLf, "<br \>")%></p>
Line 91:                         </ItemTemplate>
Line 92:                     </asp:DataList>

Source File: C:\Inetpub\vhosts\daneshafshan.ir\httpdocs\Product.aspx    Line: 90

Stack Trace:


[MissingMemberException: Public member 'replace' on type 'DBNull' not found.]
   Microsoft.VisualBasic.CompilerServices.Container.GetMembers(String& MemberName, Boolean ReportErrors) +1559580
   Microsoft.VisualBasic.CompilerServices.NewLateBinding.ObjectLateGet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack) +134
   Microsoft.VisualBasic.CompilerServices.NewLateBinding.LateGet(Object Instance, Type Type, String MemberName, Object[] Arguments, String[] ArgumentNames, Type[] TypeArguments, Boolean[] CopyBack) +1566010
   ASP.product_aspx.__DataBind__control3(Object sender, EventArgs e) in C:\Inetpub\vhosts\daneshafshan.ir\httpdocs\Product.aspx:90
   System.Web.UI.Control.OnDataBinding(EventArgs e) +98
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +174
   System.Web.UI.Control.DataBindChildren() +246
   System.Web.UI.Control.DataBind(Boolean raiseOnDataBinding) +191
   System.Web.UI.WebControls.DataList.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem) +173
   System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +858
   System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +88
   System.Web.UI.WebControls.BaseDataList.EnsureDataBound() +86
   System.Web.UI.Control.EnsureChildControls() +106
   System.Web.UI.Control.PreRenderRecursiveInternal() +66
   System.Web.UI.Control.PreRenderRecursiveInternal() +256
   System.Web.UI.Control.PreRenderRecursiveInternal() +256
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +6875


Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.7.3770.0