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How do I handle Conversion from type 'DBNull' to type 'String' is not valid

Posted By:      Posted Date: October 05, 2010    Points: 0   Category :ASP.Net

help i am getting error :

Conversion from type 'DBNull' to type 'String' is not valid

Dim OledbString As String = ("SELECT  Product_Hierarchy,Model,Origin,Item_Code,Description,Price_USD FROM [sheet1$]")
                    'Dim eAdapter As New SqlDataAdapter(sqlString, connection)
                    Dim eAdapter As New OleDbDataAdapter(OledbString, connection)
                    Dim eTable As New DataTable()

Dim i As Integer = 0
                    While (i < eTable.Rows.Count)
                        If ((eTable.Rows(i)(0)).ToString().Tri

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Im receiving a strange error Error Message: Conversion from string "15/08/2010 22:21:35" to type 'Date' is not valid.

I know this is generally down to cultural date formats etc, however the reason this is strange is it just randomly occured twice in the last week, the website has been running since october and nothing has changed,

The error constantly occured until the IIS was reset and recompilled the site, its been running fine since, however im just trying to figure out what could cause such an error to occur.

I've narrowed it down to a line of code which is:

bktime = DReader.Item("Bktime").ToString

bktime = Year(CDate(bktime)) & "-" & fmt(Month(CDate(bktime)), 2) & "-" & fmt(Day(CDate(bktime)), 2)

Has anyone else encountered this randomly occuring and is there anything i can put in place to prevent this in future?



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I have a FormView that allows a user to register for a company event. I want to do a couple of things with this form. 1. I need to write this data to a MS SQL database 2. I need to send an email confirmation of their registration to their email. I know how to do both of these things, but i am having trouble doing both at the same time. It would be nice if I could do it in one click, but I coded it into two pages to try to help simplify it. The first page allows the user to input their information into a formview and when they click the submit button, it places those answers into session variables:Protected Sub InsertButton_Click(ByVal sender As Object, ByVal e As System.Web.UI.ImageClickEventArgs) Session("FirstName") = Me.FormView1.FindControl("FirstName") Session("LastName") = Me.FormView1.FindControl("LastName")  <li> <label> First Name</label> <asp:TextBox ID="FirstName" runat="server" class="text-box" Text='<%# Bind("FirstName") %>' /> </li> </ul> </div>

ERROR-Conversion from string "'," to type 'Double' is not valid



I am having  badly stuck!!I have spent hours in trying to solve that.

I am having the following loving function:


   Public Function InsertDeleteUpdate(ByVal command As String) As Boolean
            cmd.Connection = objectconnection
            cmd.CommandText = command
            Return True
        Catch ex As Exception
            Return False
End Try

 In the above function I pass the following string:

gridcost = Convert.ToDecimal(txtcost.Text)
_date = Convert.ToDateTime(txtdatefrom.Text)
patient = Convert.ToInt32(ddlpatients.SelectedValue)

 sqlstring = "execute dbo.InsertDeleteUpdate " & patient & ",'" & _date + "'," & gridcost & ",'" & txtinsurances.Text & "','" & checkreceipt.Checked + "'," & appointment_xid

The string includes a stored procedure.The store procedure includes the following parameters:

Conversion from string "09/28/10 9.00AM" to type 'Date' is not valid.


I am getting the below error. Please see my code below and let me know what is wrong.


dim sDatetime as string = startdate & " " &starttime & "AM"

dim dt as Date = CDate(sDatetime)

I am getting the Conversion from string "09/28/10 9.00AM" to type 'Date' is not valid error in this line. 

SSIS Error in Script task: "Conversion from string "C002" to type 'Integer' is not valid"


Hi All,

I have a script component in my Dataflow that generates Error Description string.

But I am not trying to convert anything in my Script as you can see below.

Here is the Code inside the SCR_component.


Imports System
Imports System.Data
Imports System.Math
Imports Microsoft.SqlServer.Dts.Pipeline.Wrapper
Imports Microsoft.SqlServer.Dts.Runtime.Wrapper

Public Class ScriptMain
    Inherits UserComponent
    Public Overrides Sub Input0_ProcessInputRow(ByVal Row As Input0Buffer)
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   End Sub
End Class


When I run the package , it fails at this script task with the following error:

Description: System.InvalidCastException: Conversion from string "C002" to type 'Integer' is not valid.


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Hi Guys,

I have the following IF Statement checking if the function GetNexstAddress (which gets the ClientID from  GetClientFleetInfo(i).CLIENTID) . SECONDARYCITY

is there.



If GetNextAddress(GetClientFleetInfo(i).CLIENTID).SECONDARYCITY(0) = Nothing Then
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somehow I get the error.

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PS: I have searched through the forum but not found an answer yet.


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 I saw lots of post about this issue. but haven't got good solution for that yet. Basically, what I did is that: I have a table in SQL database and some of data fields allow null. I built Objectdatasource through dataset. When I built update page using dataset. It generate the following error before showing the update page correctly. It seems I have issue to retrieve the null value from the database through using objectdatasource through dataset. Any suggestions?




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'.

Source Error:

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

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I've tried to override error message when input incorrect data type in input field on HTML form. For example I have the model like this.

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When type some string in Age text box like 'test' and press submit button. I got this error message

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Please could you help me to solve this problem.

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