Type Conversion From Textbox.text?
Oct 19, 2010
Sub Calculate_G97_RPM()
Dim tmpRPM As Single = 0, MaxRPM As Single = 0
If Me.RB_English.Checked Then
[Code].....
I cannot get a value from Me.TB_SFM.Text. Upon running it is always "". It's default value is 150 and 150 shows up on the form. I get a conversion problem. I have deleted the text box, recreated and used a different name, all to no avail.
Also, If anyone has a link to a good resource on dealing with textbox data. We do alot of text boxes and are constantly converting data types. Would like to know the correct way to do it.
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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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Apr 8, 2011
I'm trying to code a program but this error repeatedly shows up and I can't for the life of me figure it out EValue of type 'String' cannot be converted to 'System.Windows.Forms.TextBox'. It appears in relation to this code
[Code]...
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Feb 19, 2012
The project I'm working on is a Multichoice RadioButton quiz with answers and percentintegers. At the end there is a MsgBox that gives the number of answers counted 'correct'and the percent 'correct'. Also after you press the confirm button on that MsgBox it emails the results to the built in information given on the SMTP information. What I am trying to do now is show the input typed into the textbox on FormA in the MsgBox at the very end.
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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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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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Feb 7, 2012
I am pulling data from a local MSSQL database using a stored procedure, then send the data to a web service. Every part of the component works well except for a pesky problem will a DBNull being returned from the DataRow field, when I know that the field is not null and has valid data. The database and associated INSERT statements that add to this field are designed to not allow NULL entries. When I debug break the program on or right before the line that throws the error I see that the field has valid data for the current row.If I add a null check to the code (as below) the operation continues as normal:
Dim dataResultsTable = Me.myViewTableAdapter.GetData(int)
For Each myDataRow In dataResultsTable.Rows
If worker.CancellationPending Then
[code]....
Why is the read operation returning DBNull instead of the data in the database?
EDIT: Just to be clear, the operation does return the proper data, but the data is not being saved into the variable.
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Feb 21, 2012
I declare my dates as the following in my code:
Dim DeliveryDate as Date
But i am now trying to declare time however i keep getting an error because i cannot get the type correct. I tried the following but get the following error: "Conversion from type 'Timespan' to type 'integer' is not valid".
Dim DeliveryTime as DateTime
Dim DeliveryTime as Integer
In my database the DeliveryTime type is set to Time(7) so i would assume there should be 'Time' which i could use to declare it, but there isnt. What is the correct type i should be using?
Here is my exact code. There error is Input string was not in correct format:
GraphDate4 = String.Empty
DeliveryProducts = "{ name: 'DeliveryProducts', data: ["
If DataReader4.HasRows Then
[Code].....
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Oct 10, 2010
I'm getting the error "Conversion from type 'DBNull' to type 'Date' is not valid."here's the line generating the error.
dtReady.Value = dSet.Tables("Db").Rows(Inc).Item("Fixed_Date")
I'm using a date/time picker control and sending the db value to it. I know that the value is null, but I don't understand why the Picker can't be blank. Is there a way to let it be blank? Or should I set up a way to check for nulls and assign today's date or something just in case?
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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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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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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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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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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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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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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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Sep 8, 2009
I'm creating a login system with ASP.NET and VB.NET, and I have the webpage read a MySQL database for a table with the usernames and passwords. In the 1st column is an auto-incrementing id number, 2nd is their username, and 3rd is the password. Here's the code I have for searching through the table (which is a GridView named "logintable"), but I get the error "Conversion from type 'GridViewRow' to type 'Integer' is not valid. It seems like this code should work, so what's wrong? [Code]
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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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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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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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Dec 30, 2011
When I close my form without saving I want to check if the data on my form has changed since the last time I saved the data.This peace of code, which I included at the bottom always worked fine.Except when I compade a DateTimePicker with a null value in the db.Than I get the error "Conversion from type 'DBNull' to type 'Date' is not valid."Probably on this peace of
Me.dtpVrijeDatum01.Value.Date <> CDate(reader("VrijDatumVeld01")).Date Or
Me.dtpVrijeDatum02.Value.Date <> CDate(reader("VrijDatumVeld02")).Date Or
Me.dtpVrijeDatum03.Value.Date <> CDate(reader("VrijDatumVeld03")).Date Or
Me.dtpVrijeDatum04.Value.Date <> CDate(reader("VrijDatumVeld04")).Date Or
Me.dtpVrijeDatum05.Value.Date <> CDate(reader("VrijDatumVeld05")).Date Or
The total code to check the changes is:
Private Sub CheckForChanges()
LeesCheckboxWaarde(Me.chkFacAdrIsBezAdr, intCheckFacAdresIsBez)
LeesCheckboxWaarde(Me.chkPosAdrIsBezAdr, intCheckPosAdresIsBez)
[code]....
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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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Apr 7, 2012
I'm storing dates intoa table like:vb.net "INSERT INTO myTable (datum) VALUES ('" & Convert.ToDateTime(dgvrow.Cells(0).Value).ToString("yyyy/MM/dd hh:mm:ss") & "'" & ")", conn) This works perfectly. After storing the dates I need to load /show them into a MonthCalendar. This is where the error occurs.
[Code]...
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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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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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Jun 2, 2011
I am using a code to generate an id for a table.But it is giving 'Conversion from type dbnull to type integer is not valid' exception.Now I know that this is due to the table being an empty set.But it works properly if there is already a row in the table. [code] When I click on 'new' button it generates an id pattern in the textbox 't1'.But it gives that dbnull exception first.I am using mysql as backend and Visual Studio 2008 as frontend.Any ideas?
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Jun 22, 2011
I have a query in my DAL that results 1 item, a date. It's either a date or null. But I get an error when the value is null. Conversion from type 'DBNull' to type 'Date' is not valid. Query
[Code]...
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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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Jun 5, 2011
i have code below...but i cannot run because this error..."Conversion from type 'DBNull' to type 'Boolean' is not valid."
CheckBox1.Checked = DataGridView2.CurrentRow.Cells(10).Value
CheckBox2.Checked = DataGridView2.CurrentRow.Cells(11).Value
CheckBox3.Checked = DataGridView2.CurrentRow.Cells(12).Value
CheckBox4.Checked = DataGridView2.CurrentRow.Cells(13).Value
CheckBox5.Checked = DataGridView2.CurrentRow.Cells(14).Value
how i have to set in my table to insert input 1 or 0..
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Jul 14, 2011
I am getting this exception from the following VB.NET code for only certain months: System. InvalidCastException: Conversion from type 'DBNull' to type 'Date' is not valid.It happens on the line:if CDate(dRow("CompleteDate")).ToString("d") = arrWeekYear(i, 1).ToString("d") Then.If I understand this correctly, then the problem is I am trying to compare some NULL values for CompleteDate to a non-NULL value.However for some of the more recent records, it does not. But I am able to get output from the T-SQL query with same date range and there are no errors; it runs quickly also. And I examined this T-SQL query for both "Date_ Completed" and "Review_Date" NULL values, but either way,"CompleteDate" was always = NON-Null value.So I do not understand how this is happening.[code]When I add this line above the error-causing line above, my report times out for these months.If Not dRow("CompleteDate") Is System.DBNull.Value Then
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