I'm not sure if i titled this question properly or am asking it properly, but here goes.I've got serialized objects (in XML) stored in a database, along with a string/varchar indicating the type.
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I am trying to concate string and system.type using operator & in VB and i am getting error :
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I have tried several ways but can not make this work. We are using .NET 2.0
vb
If DataGridView1.Columns(e.ColumnIndex).ValueType = GetType(String) Then
'this did not work either:
ElseIf DataGridView1.Columns(e.ColumnIndex).ValueType = GetType(DateTime)
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Quote:
Error15Operator '=' is not defined for types 'System.Type' and 'System.Type'.
I am getting the following erro message: "Unable to cast object of type 'System.String' to type 'System.Predicate`1[System.String]'." on the line of code: If Not StrgFrag.Exists(wrd) Then I was expecting a True/False response and assumed it would work given that wrd is a String variables and StrgFrag in a List(of String). Do I need to reference the wrd variable differently? Dim StrgFrag As New List(Of String)
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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
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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
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Unable to cast object of type 'System.String' to type 'System.Windows.Forms.TextBox'.
View 12 RepliesIs it possible to extend primitive types such as System.String and System.Int32 (IE: integer) in .Net 4 and if so how?
To be more specific, I am aware of the concept of partial classes but this doesnt seem to be the answer. Also I find that System.String is not inheritable and Int32 is a structure.
Lastly I am interested in knowing both a VB.Net and C# answer to the above question.
I am getting a really bizarre error and it makes no sense at all.Basically I have a user entity which has a Password property. This property is of Type Binary, the server data type being Binary(512).I am reading this value in and converting it to a byte array. However whenever I run my code I am getting a completely unrelated error of Unable to cast object of type 'System.Guid' to type 'System.String'.This strikes me as very odd since I am not using a property or variable of type string or GUID anywhere in this procedure where it falls over.
The code is below:
Public Shared Function ValidateUser(ByVal username As String, ByVal password As String) As UserValidationMessage
Using db As New EntityMapDataContext
Dim u = From user In db.Users
Where user.Username = username
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When testing the followng code from Mastering VB2010, I get an Unable to cast object of type 'System.String' to type 'System.IFormatProvider' exception.In the Button1_Click event code Dim strmOut As New System.IO.StringWriter(SaveFileDialog1.FileName)the 'SaveFileDialog1. FileName' is underlined with a green squiggle and displays the following tool tip:Runtime errors might occur when converting 'String' to'System. Iformat Provider'.This is apparrently the problem but what does it mean and how do I fix it to get the code to work? 'Code being tested that runs the exception:Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click.[code]
View 12 RepliesI have a page that get value from SQL. I'm having a problem when I initialize Label object with field having TEXT data type.[code]...
View 4 RepliesI 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'.
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I'm getting a sporadic 'Unable to cast object of type 'System.Int32' to type 'System.String' Exceptions at .SingleorDefault() in the below code. It works 9/10 times but randomly it throws an exception. I made sure that SettingID that i'm passing has no Null Values and the data in the table always exists for the settingID, and i'm always passing SettingID as Integer.
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iNCEEB = .First.NCEEB '<-- Im getting the error in this line, iNCEEB is integer .First.NCEEB is short.
NCEEB Server Datatype property is smallint
where is that "to type 'System.String'." coming from?
I'm using vs2008 and mssql2008.
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I has the following code in my vb.net:
Code: Dim sql2 As String = " SELECT * FROM Etiqa_Image_Details where TransmissionID='" & Request("id") & "' " With objDB.OpenDataReader(sql2) While .Read()
If .Item("ImageType") = "Invoice" Then imgInv.ImageUrl =
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However,i get this error while retrieving the image path(Varchar in sql server 2000) and display the image on the web.
Unable to cast object of type 'System.String' to type 'System.Byte[]'.
Actually in my database, i am just storing the image path where the image store...And now when I browsing the web, it should get the image path out and find the image through the image path and then display on the web....
[code]Unable to cast the type 'System.String' to type 'System.IComparable'. LINQ to Entities only supports casting Entity Data Model primitive types. I'm in a DDD-layered application, so the parameter should stay the same as the called method is an overridden interface (eg. if i change this, i have to do this for 200 times or so, because it's in VB.Net and not in C# (= 1 change) )
View 1 RepliesPrivate
Sub cmdExit_Click(ByVal
sender As System.Object,
ByVal e
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Using the code
Dim dr As OleDbDataReader
Dim dbconn As New OleDbConnection
dbconn.ConnectionString =
"Provider=Microsoft.Jet.OLEDB.4.0;Data source=" & "C:MyData.mdb"
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I can extract
ColumnName = Item
ColumnSize = 80
DataType = System.String
But to write a Parameter I need to convert this to
UpDateCmd.Parameters.Add("Item", OleDbType.BSTR, 80).Value
Is there an easier way of converting DataType = System.String to OleDbType.BSTR than having to make a list with Select Case?Or is there a method to find OleDbType.BSTR rather than reading DataType = System.String?I also tried
SchemaTable = dbconn.GetOleDbSchemaTable(System.Data.OleDb.
OleDbSchemaGuid.Columns, New Object() {Nothing, Nothing, "Auction"})
Dim RowCount As Int32
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But that also returns DataType = System.String.
Value of type 'System.Func(Of String, String)' cannot be converted to 'System.Converter(Of String, String)
Why? They are both effectively a function pointer (or delegate?) to a function that accept a string and return a string.
I converted the Microsoft's datagridviewcustomcolumn sample into vb.net to host maskedtextbox control. The maskedtextbox column works fine when it is not bound to database field. But it raises exception when it is bound. I have shaded the line that raises the exception.
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I have a problem with Operator '&' someone may with this problem.
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I have an Array of Column Titles and Column tpyes that i want to add to my DataGridView but dont
know how to 'Cast the string' to the required Column type?
Example (doesnt work but might give you an idea what i an after:[code...]
Adding different types of Colums to a DataGridView when the type starts as a string
View 1 RepliesFor I = 0 To 10
If Items.Count = 0 Then Exit For
Dim T As New Thread(AddressOf Thread)
T.Start(New Object() {"Test", "Test"})
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When I put same code in empty project it works.
i am learning vb. net for my IT class. i have been set the task of making a simple web browser. i have been able to insert a web browser window into the form and set the url in the properties tab in the editor. i have inserted a buton and a textbox and have written code so that when clicked the text in the textbox will be set as the url property. below is the code i have used
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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]
View 2 RepliesI had write code (just for learning), the codes :
dim Temp as string
Temp = Recordset("
Table_Field")
but, when I start Debugging the error messages "Unable to cast object of type 'ADODB.InternalField' to type 'System.String"
I'm new to VB 2005, the code below is actualy coded from VB 6 and just converted it to VB 2005. I'm having trouble with line that's on bold letters.In VB 6 this works just ok. By the way the error message is "Unable to cast object of type 'System.String' to type 'ADODB.Connection'." [code]
View 5 RepliesI 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:
i am downloading data from xml using linq library those data i want to add them on a textblock item
TextBlock1.Text = TextBlock1.Text & result
but it has an error :
Error 1 Operator '&' is not defined for types 'String' and 'System.Xml.Linq.XElement'.
When i am changing this line to :
TextBlock1.Text = TextBlock1.Text & result.Tostring
it works but it adds this data :
"<"data> data <"/data>
instead of :
hello