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Object of type 'System.Int32' cannot be converted to type 'System.String

Posted By:      Posted Date: October 13, 2010    Points: 0   Category :ASP.Net
 

When i'm trying to update a table using dynamic data, i'm getting the following error. I was trying to google the solution for the whole day, but it didnt work. I tried to declare the type of parameters like this

<asp:LinqDataSource ID="DetailsDataSource" runat="server" EnableUpdate="true"
                OnInserting="DetailsDataSource_Inserting"
                onselected="DetailsDataSource_Selected"
                onupdating="DetailsDataSource_Updating" > <UpdateParameters><asp:Parameter Name="PK_ID" Type="Int32" /><asp:Parameter Name="id" Type="Int32" />
                <asp:Parameter Name="c_titulu" Type="Int32" />
                <asp:Parameter Name="perio" Type="Int32" />
            


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I am trying to upload a picture into database using FormView insertItemTemplate. 

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Xinguo

 

Error attached below:

Unable to cast object of type 'System.DBNull' to type 'System.String'.

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.InvalidCastException: Unable to cast object of type 'System.DBNull' to type 'System.String'.

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Line 1178:            get {
Line 1179:                try {
Line 1180:                    return ((string)(this[this.tablemember.CurrentCityStateColumn]));
Line 1181:                

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using

System;

using

System.Collections;

using

System.Configuration;

using

System.Data;

using

System.Linq;

using

System.Web;

using

System.Web.Security;

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TITLE: Microsoft Visual Studio
------------------------------

An error occurred while reading data from the query result set.
Unable to cast COM object of type 'System.__ComObject' to interface type 'IRowset'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{0C733A7C-2A1C-11CE-ADE5-00AA0044773D}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).

------------------------------
ADDITIONAL INFORMATION:

Unable to cast COM object of type 'System.__ComObject' to interface type 'IRowset'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{0C733A7C-2A1C-11CE-ADE5-00AA0044773D}' failed due to the following error: No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)). (System.Data)

---------

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