VS 2008 - Setting Data Type To String?

Jun 14, 2009

How you set data type to string? I am using this source:
Dim Resp As String = AxInet1.OpenURL("[URL]", vbNullString)
TextBox1.Text = Resp
I need to replace the vbnullstring. On other forums, people are saying to use icstring but still i am getting an error that it is not declared and I added reference to imports system.text.

Errors:
A first chance exception of type 'System.Runtime.InteropServices.COMException' occurred in AxInterop.InetCtlsObjects.dll
A first chance exception of type 'System.ArgumentException' occurred in AxInterop.InetCtlsObjects.dll

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Create A Function Which Have Either 1 Parameter With A String As Data Type Or 2 Parameters With Double As Data Type?

Jun 11, 2012

I need to create a function which have either 1 parameter with a string as data type or 2 parameters with double as data type.Something like the substring method.

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Setting A DataSet Row Value To Nothing Initialize It To The Data Type Minvalue?

Dec 2, 2010

When setting a DataSet row column to Nothing, like row.Date = Nothing, why does it initialize it to the data type minvalue? In this case a date, that gets set to 0000-01-01. The column is set to allow null etc., and if I don't set the row to anything at all, it will leave the column empty. So why does Nothing act this way?

In C# I would've set it to DbNull, I guess, but I'm a tad green on VB.NET - as you might be able to tell. :)

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Converting Double Data Type To String Data Type

Jan 31, 2010

I have a program that calculates commission, but if the commission is nothing then I do not want it to show a zero commission. I want a message box to show a message that there is no commission earned.

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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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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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Ado.net Error (Unable To Cast Object Of Type 'System.String' To Type 'System.Data.IDataReader'.)?

Jan 29, 2012

I am getting this error when I am tring to load string type to data table)

Using connection As New SqlConnection("connectionstring;")
connection.Open()
Using Command As New SqlCommand("SELECT ClientId,forename,surname from t_clientdetails

[code].....

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ASP.Net Error - Unable To Cast Object Of Type 'System.String' To Type 'System.Data.DataTable'

Oct 4, 2009

I get the below error Unable to cast object of type 'System.String' to type 'System.Data.DataTable'.This is the code I'm using

Dim str As String = String.Empty
If (Session("Brief") IsNot Nothing) Then
Dim dt As DataTable = Session("Brief")
If (dt.Rows.Count > 0) Then

[code]....

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Unable To Cast Object Of Type X To Type X On Setting DataSource To A Table?

Feb 19, 2012

Columns 0 & 1 are filled from a DataAdapter from Access Database and three are added. I had this working, but I changed it to check for the column "Feed" so I could add several Locations. At first this worked,but I did someething in perfecting it and it now fails after filling the first row of the datagridview (dgvFdMed).I ran a check and the table LotsTab has 8 rows filled. Column 1 & 2 are strings and the database appears they are fine. The added columns have just been created with no value. My plan is to enter the values and then use the data from the grid.

Private Sub sfillGrid(ByVal Loc As String)
Dim i As Integer
Dim column As DataGridViewColumn

[code]....

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VS 2008 Dragdrop - Check If The Present Data Type Inherits From The Base Type

Aug 20, 2009

I have a number of controls (Device1, Device2, etc.) that all inherit from BaseDeviceControl. In the DragEnter event handler I am trying to test for the correct type by using the BaseDevvceControl like this....

[Code]....

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VS 2008 Casting Data-type To Same Data-type?

Dec 5, 2009

I have one question. i have seen some codes like:

Req = CType(System.Net.HttpWebRequest.Create("url"), Net.HttpWebRequest)

Is it really necessary to cast the same type, or is there a difference when its not casted.

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VS 2008 Value Of Type Ƈ-dimensional Array Of String' Cannot Be Converted To 'String'

Jan 18, 2011

I'm making a card game and the first thing I'm doing for it is generating a random card. I used an array for the cards (can't think of a better way to assign a picturebox to a card picture other then a huge select case block). I'm trying to split the 2D array into two parts but it doesn't work.

My current

vb
Public Class frmMain
Private Function Flop() 'First three common cards to be displayed.

[Code].....

I looked around online and I don't think a list will work for my 2-dimensional array.

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Converting A String Into Data Type

Oct 2, 2009

I'm trying to add data into a datagridview cell but I keep on getting a data type error.[code]Value of type 'Char' cannot be converted to 'System. Windows.Forms.DataGridViewCell'.[quote]

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Getting A Data Type Mismatch On This SQL String?

Oct 19, 2011

I'm getting a data type mismatch on this SQL string.

If cmbPayPlan.SelectedIndex = 0 Then
DF = Date.Now.Date.AddDays(30)
ElseIf cmbPayPlan.SelectedIndex = 1 Then
DF = Date.Now.Date.AddDays(60)

[code]....

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Htmlelement To String Data Type?

Oct 10, 2011

is there a way to convert an htmlelement to a string ?

for ex Dim myhtm as HtmlElement = webbrowser1.document.getelementbyid("specificelement")

'to the Dim myhtm2 as string = myhtml

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VS 2008 Unable To Cast Object Of Type 'System.String' To Type 'System.IFormatProvider'

Oct 20, 2010

I have a bit of trouble right here, I am trying to get the data from the site and input them in the listview. Well, when my main app start to load through on debug, then it start to display a warning. The warning is: Unable to cast object of type 'System.String' to type 'System.IFormatProvider'.

[Code]...

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Parameters Data Type - Add Parameter With Same Data Type As Column Data Type

Feb 26, 2012

For each column in data table i want to add parameter with same data type as column data type. But looks it's not that simple.


Dim cmd As New SqlCommand
Dim dType As New System.Data.SqlDbType

For Each cl As DataColumn In DataTable1.Columns

[CODE]...

How can I do this?

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Size Of The Length Field For A VB String Data Type?

Feb 10, 2010

A string can contain from 0 to approximately 2 billion (2 ^ 31) Unicode characters. Does this mean the length field for the string is a 4 byte unsigned binary field, or is it a 4 byte signed binary ?

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Data Type Validation - Get An Invalidcastexception If The User Inputs A String

Nov 25, 2009

Im trying to improve some apps ive written, the first is a console app... Im trying to get it so that i wont get an invalidcastexception if the user inputs a string, when the variable is type "Double"

[Code]....

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Data Type Mismatch Between Vb Date Datatype And Ms Access Datetime Data Type?

Dec 27, 2010

I'v designed a ms access database table with one field having Datetime datatype. I can Insert data into it from vb.net front end by trns_dt DateTime.Now.DateBut when I fetch records from the tableand assign the dataset datasource as da, it shows datatype mismatch error.

daleDbDataAdapter("SelectDaily_Transactiondtp_from_dt.value dtp_To.value con)
dsDataSet

[code].....

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Database Deleting Rows - Error - Value Of Type String Cannot Be Converted To 'System.Data.OleDb.OleDbConnection'

Sep 15, 2010

I have been trying my hand at this for some days now and just cant get anything to work. Below is the code im currently using to delete a row from a database table, the problem when trying to build the project line 5 is giving this error about the value con" Value of type String cannot be converted to 'System.Data.OleDb.OleDbConnection' "

Dim con As String = "Provider=Microsoft.Jet.OLEDB.4.0;" & "Data Source=Customers.mdb"
Dim cnn As New OleDb.OleDbConnection(con)
cnn.Open()

[CODE]...

I have also tried using this code below, but to no success. Im basically just looking for something rock soild that i can use to accomplish this task. Been stuck on this for quite a while now.

CustDetailsTableAdapter1.Connection.Open()
Me.CustDetailsTableAdapter1.Delete(txtDelCustN.Text, txtDelCustSname.Text, txtDelCustTel.Text, txtDelCustAddr.Text)
CustDetailsTableAdapter1.Connection.Close()

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VS 2008 - Conversion From String To Type (Not Valid)

Aug 20, 2010

I get this error:
"Conversion from string "7F676981" to type 'Long' is not valid."

When using this
Reader.Position = &HD044
TextBox2.Text = Reader.ReadHexString(4)
TextBox2.Text = CLng(TextBox2.Text)

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VS 2008 Conversion From String To Type 'Integer'

Mar 18, 2012

So I'm trying to create a program in Visual Basic for my uni coursework and I'm kinda stumped a tad here. I've created most of it, I just need to write the files to a txt file (in the same folder as the program [bin/debug]).

I'm creating a some kind of employee reference form. Fill in your details, figures out gross pay, net pay and all the taxes an employer has to deal with. When you press Save, the details should all write to a file and I should be able to select from multiple ID's in my combobox for the employee ID reference. If I try to save a file with the same ID number I should get thrown an error. every ID should be saved under the Employee ID box.

Here's my code for the save button:

Private Sub btnSave_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnSave.Click
Dim s As employee = New employee

[Code].....

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VS 2008 - Conversion From String To Type Integer Not Valid

Jul 29, 2010

I am working on a program that has a combobox that gives you selections for email address endings, but when I try to enter it in as part of the final email address get an error. Here is my
mail.To.Add(TextBox1.Text(ComboBox1.Text))

When I click debug, it give me this error. "Conversion from string "@txt.att.net" to type 'Integer' is not valid."
"@txt.att.net" is the value of the combobox selection.
In the end it should be something like: "anything@txt.att.net"
(Textbox1.text = "Anything" & the current ComboBox1.text selection = "@txt.att.net")

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VS 2008 - Converting From String To Type Double Not Valid

Mar 4, 2010

I'm trying to delete the 2 last characters of a string if they are "||". This is my
Dim MyReader As Microsoft.VisualBasic.FileIO.TextFieldParser
MyReader = My.Computer.FileSystem.OpenTextFieldParser(playlist)
Dim TextFields As String() = MyReader.ReadFields()
Dim last As String = TextFields.Last
If last.Substring(last - 2) = "||" Then
last.Remove(last - 2)
End If
But it gave me the following error on the highlighted line:
"The converting from the string to the type Double is not valid."

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VS 2008 DBNull To Type String Is Not Valid. From A Datagrid

Aug 13, 2010

I am trying to populate a textbox.text with a value with a record from a datagrid. I can get my value from the datagrid by the following

Dim eRow As Integer
eRow = datagrid.CurrentRow.Index
txtSelecteditem.Text = datagrid.Item(0, eRow).Value

This all works fin when there is a value in the cell it is picking up. However, I hit a problem when this filed is blank.

The error I get is: Conversion from type 'DBNull' to type 'String' is not valid.

How can I get the textbox to populate with null if the field is null.

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VS 2008 Value Of Type 'String' Cannot Be Converted To 'System.Net.IPAddress'

Dec 3, 2009

listener = New Net.Sockets.TcpListener("127.0.0.1", 32111)

Value of type 'String' cannot be converted to 'System.Net.IPAddress'.

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Setting File Type Value

Jun 11, 2011

I have a webbrowser.So once webbrowser is completed then it should add the specified value in [TEX] [/TEX] value in php.When webbrowser is completed then this http://screensnapr.com/e/LCgzhP.png value will be our specified value.I tried using this on webbrowser completion. Webbrowser1.Document. getelementbyid("the_file").SetAttribute("value", "C:/test.jpg")

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