Explicit Conversion From UDT(User Defined Type) To String Type?

Jul 22, 2010

Following is my code. Private Structure DISPLAY_ELEMENT_TYPE

[Code]...

Actually this is vb6 to .net converted code. I m getting compile error at following line

temp = Lset(DispElem(i)) bcz Lset is not supported in .Net Lset accept string data type for first parameter and interger for second.If you know any alternet solution or if you have any source code for Explicit convert UDT to string type and vice versa.

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Explicit Conversion - Convert The Variable D From Double Type To Integer Type And Store The Result As 132

Oct 22, 2009

I want to use explicit conversion (CType function in VB.NET) to convert the variable d from double type to integer type and store the result as 132.

Imports System.Console
Module Module1

Sub Main()

[CODE]...

This is my code. But Visual Basic tells me an error: Error1Type 'i' is not defined.C:\Users\mihaispr\Desktop\Conversie explicita\Conversie explicita\Module1.vb1922Conversie explicita

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Cannot Implicitly Convert Type 'decimal' To 'int'. An Explicit Conversion Exists?

Mar 7, 2009

Cannot implicitly convert type 'decimal' to 'int'. An explicit conversion exists

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Cannot Implicitly Convert Type 'decimal' To 'int'. An Explicit Conversion Exists (are You Missing A Cast?)

Jul 12, 2011

I am calling a GetSerialNo function But it showing some error like:

Cannot implicitly convert type 'decimal' to 'int'. An explicit conversion exists (are you missing a cast?).

Here is the code:

CODE:

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Type Cast To User Defined Type In .net?

Jun 11, 2009

i want to know how to type cast to user defined type in vb.net.I have a mark object which contains student id , subject name,subject id and mark. I have to read the subject id from a combo box and read corresponding mark value from it to a text box.

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DB/Reporting :: Conversion From Type DBnull To Type String Is Not Valid When Inserting A Record

Mar 22, 2010

I'm trying to add a new record to my database but i keep getting the message - "conversion from type DBnull to type string is not valid". I think its something to do with the Employee ID when VB attempts to save it to the database my code is below

Imports System.Data.OleDb
Public Class Add
Private Sub DisplayRow()

[Code]....

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Error: Microsoft.VisualBasic: Conversion From Type 'DataRowView' To Type 'String' Is Not Valid

May 25, 2011

I now have SQL Parameters set up and I'm using them to save/delete/add my data. This all works well, except when it's trying to save a combobox to the datatable it appears with the error above.Majority of my comboboxes have datasources, and the valuemembers of these are the actual list items, not the ID's of the list items.I'm not sure why this error could be happening, I'm fairly sure I've connected everything to the binding source correctly; I've checked it a few times.Does anybody know what the cause of this could be? I've looked around a bit and I haven't found much

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IDE :: System.InvalidCastException: Conversion From Type 'DBNull' To Type 'String' Is Not Valid

May 16, 2007

I have these errors when creating my website?

Error 1Server Error in '/ Application. -------------------------------------------------------------------------------- Conversion from type 'DBNull' to type 'String' is not valid. 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: Conversion from type 'DBNull' to type 'String' is not valid. Source Error: Line 64:
Line 65:

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VS 2008 : Error: Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Jun 15, 2009

how can I solve this error without having to fill all of my fields. Some of the fields in my database are Nulls and some have records.

Error: Conversion from type 'DBNull' to type 'String' is not valid.

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Error : Conversion From Type 'DataGridViewTextBoxCell' To Type 'String' Is Not Valid

May 2, 2010

I am getting the error "Conversion from type 'DataGridViewTextBoxCell' to type 'String' is not valid." When trying to display a cell from DGV in a listbox.I have my variable for the cell reference as follows:

Dim a As Object
a = DataGridView1(4,1)

To insert it in the listbox as follows:

lstLetter.Items.Add(String.Format(a))

I tried:

lstLetter.Items.Add(a)

This will not actually display the entry inside the referenced cell, it shows this in my listbox instead:

DataGridView TextBoxCell { ColumnIndex=4, RowIndex=1 }

how I need to convert this to display.

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Error: Conversion From Type DBNull To Type String Is Not Valid

Jul 29, 2011

I was tried to get quantity from db make use of the selection in list box. I got answered with listbox1. If i selected the item in listbox1 the quantity would appear in textbox1. But in this same code will not work for listbox2 with textbox4.. Here i given the code...

$Con.open()
$Dim cd as new oledb.oledbcommand("Select Quantity from tlist where tool_name"& "'"listbox2.selecteditem & "'" & "", con)

[Code]....

Here i got the error as "Conversion from type DBNull to type string is not valid"

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Error:Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Dec 13, 2010

I've been getting this error when pulling data from a recordset. It is coming from a null entry and as a newbie to VB2008 I'm not sure how to get around this.

here is my code lblShipping.Text = reader("CARRIERCODE")

the error:Conversion from type 'DBNull' to type 'String' is not valid. Basically what i'm attempting to accomplish is to see if there is anything in that field. If so put it into the text box if not leave it blank.

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VS 2008 - Conversion From Type 'InternalField' To Type 'String' Is Not Valid

Jul 9, 2009

We get this error: Conversion from type 'InternalField' to type 'String' is not valid. When we get to this in our Dim fname2 = fname args.Graphics.DrawString(fname2, New Font("arial", 8), Brushes.Black, 5, 5) fname is a nvarchar variable from a recordset. It's just a name.

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VS 2008 : Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Jan 20, 2010

I use following codes to retrieve data from table, but get error Conversion from type 'DBNull' to type 'String' is not valid.

str = "Select * from gpass where vou_no= " & Val(Me.txtGat.Text) & " And Date = '" & Me.txtDat.Text & "'"
dt = GetTable(str)
If (dt.Rows.Count > 0) Then

[code]....

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VS 2008 Conversion From Type 'DBNull' To Type 'String' Is Not Valid?

Apr 29, 2009

I am importing an Excel spreadsheet, turning it into a dataset and inserting the results into SQL Server (only 100 rows).

I am having an issue with one of the date columns in Excel, which can have a value or not. The "F" column is the one that may be blank and this is the error I get: Conversion from type 'DBNull' to type 'String' is not valid.

How can I add a check to the Dim F As Date = CDate(row(5)) to handle a null?

VB
' The use of letters instead of
' more descriptive variables is
' strictly for this sample peice

[Code].....

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VS 2010 Conversion From Type 'FileInfo' To Type 'String' Is Not Valid?

May 1, 2012

I get the error: Conversion from type 'FileInfo' to type 'String' is not valid. This happens in between try and end try

Private Sub CopyNotes()
Dim NotesBase As String
Dim NotesTgt As String

[Code].....

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VS 2010 Conversion From Type 'Range' To Type 'String' Not Valid

Aug 30, 2011

I have the following code to use Words spellcheck feature on a RTB. Once you pick the correct word in the spellcheck box and press change I get the error on th efollwoing line

strResult = Left(objDoc.Content, Len(objDoc.Content) - 1)

I tried to use CType() but still complains.

If (Len(t.Text) = 0) Then
'nahhhhhhhhhhh
Else

[Code]....

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'Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Aug 19, 2009

At run time my application gives an error of "Conversion from type "DBNull" to type "String" is not valid. In my form only one field - Add_info is an optional field which might be filled or not by the user. Before, I had an error when an apostrophe was used so i updated the code as highlighted below. This in return removed the apostrophe error but generated an error whenever there is an empty additional field. [code]

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Conversion From Type 'DataTable' To Type 'String' Is Not Valid

Aug 9, 2011

i encounter this error while passing a string as datatable.

I populate combobox1 with tables/sheets from excel and each table has datarows which i want to get the data and import to sql corresponding table, so, I declare

Dim XLSTableName as String = Combobox1.SelectedItem

And I encounter the this error : Conversion from type 'DataTable' to type 'String' is not valid

how do i return the combobox1.SelectedItem as Datatable cos if i declare

Dim XLSTableName as DataTable and pass it to the select Command thus:

Dim objCmdSelect As New OleDbCommand("SELECT * FROM [" & XLSTableName & "], ODBConn)

to obtain the dataRows I got the following error: operator '&' is not defined for types 'String' and System.Data.DataTable'

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Conversion From Type 'DBNull' To Type 'String' Is Not Valid

Jul 19, 2010

I am getting the above error msg with [code]...

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Conversion From Type 'DBNull' To Type 'String' Is Not Valid?

Feb 22, 2012

Im trying to check a specific item if its already expired. And for some reason, im getting this error "Conversion from type 'DBNull' to type 'String' is not valid."

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Conversion From Type '_ComObject' To Type 'String' Is Not Valid?

Jan 7, 2009

i got following error while i am running my program here is the code scratch where i got an exception :

Try
Dim de As New DirectoryEntry("LDAP://xxx/dc=xxx,dc=com", "aaa", "secret")
Dim MyAttributes As PropertyCollection
Dim MyAttributeName As String
Dim myValue As String

[Code]...

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Conversion From Type DBNull To Type String Is Not Valid

Dec 12, 2011

I am pulling records from an access database onto my form and have a "Next" button to get to the next record, but every time it gets to the 5th record, the error msg, "Conversion from type DBNull to type String is not valid." because one of the text boxes (fields) from the database is empty.

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SQL - Conversion From Type 'DBNull' To Type 'String' Is Not Valid?

Feb 10, 2010

I'm using the following code to assign record fields to variable:

Dim IPAddress As String = dt.Rows(i)("IPAddress")

Unfortunartely if the field is empty in the row i get the following error:

Conversion from type 'DBNull' to type 'String' is not valid.How can I get around this error?

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Conversion Of String Type To Groupbox Type?

Sep 2, 2009

I am currently in this project whereby i need to initiate the color of group boxes to be pink in color at the start of the application.

However, as there are a few hundred groupboxes, i have been trying to automate the entire process.

The name of each groupbox is sth lik "grp_8_p1_21_1" whereby the "21" and the "1" will be increasing incrementally by 1 each time.

What i have done is to use a loop to increase the variable, but as i tried to run it, it was saying that i couldn't use a string with groupbox properties...so i was just wondering is there any way to change the string variable to a groupbox type?

For i = 21 To 26
i.ToString()
Dim first As String = "grp_8_p1_"
Dim second As String = "_"

[Code].....

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'User Defined Type Not Defined' When Trying To Define A New 'process'

Dec 29, 2011

I am trying to redirect command line output to a list box in a vba macro, and I've found some code that I think might point me in the right direction, but I keep on getting the same error. When I use this code [code]It gives me the error in the title and highlights the first declaration line.What does it take to define a new "process".

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Conversion From Type 'String' To Type 'String' Is Not Valid

Dec 21, 2009

I'm in the process of porting an old excel addin that was writen in VBA to VB .NET. The Excel addin interacts with a number of external com objects. The code sorta looks like this:[code...]

What I'm trying to do is read the string from the COM object and get it in durr for use later in my program.

That second line results in the exception posted above. If I try casting with CStr/CType I get the same exception.

The visual studio watch window reports the type of hurr.getString as a "System.__ComObject" whereas the VBA watch window reports the type as "Variant/Object/String".

Microsoft.VisualBasic.Information.TypeName(hurr.getString) says the type is "String".

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Conversion Error On Line 5 Stating 'Conversion From String 'S' To Type 'Double' Is Not Valid

Apr 8, 2009

a user will enter a number, n, which ranges from 1 to 30. they will also enter a "P" or an "S" (sum or product). depending on which was selected, it will calculate the sum or product of the numbers from 1 to n.i'm having a conversion error on line 5 stating "Conversion from string "S" to type 'Double' is not valid." [code]

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"conversion From Type String To Type Double Is Not Valid"

Aug 13, 2009

I created an application in vb.net 2005. It works fine on my machine. I tested several different test machines and all were working fine. As for the client, it's generating an error. My application reads from an excel sheet and imports the values to an oracle database. the error being generated is: "conversion from type string to type double is not valid". Why is it generating only on the client's computer and not mine?

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Converting A User-defined Type?

Apr 16, 2012

I apologize in advance about asking a newbie question. I am a less-than-intermediate programmer who has done most of his work in VB6, and now trying to wrap my mind around the new concepts of the NET languages.In VB 2010, I have a Structure called "Direction", with one data member -- an integer named "Value". It's supposed to represent a value of degrees from 0 to 359.

Public Structure Direction
Private d As Integer

[code].....

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