Syntax Error Null Check Datatable / Gridview Asp.net Vb?
May 21, 2010
I have this code:Dim Result As New DataTable DataAdapter.Fill(Result)
'bind data to visible surname/name grid If Result.Rows.Count = 0 Then NoInputBottom.Text = "No Results. Please widen your search criteria and try again" NoInputTop.Text = "No Results. widen your search criteria and try again" Else
GV.DataSource = Result
GV.DataBind()
End If
I have also tried moving the check to the gridview like so:
If GV.Columns.Count = 0 Then
NoInputBottom.Text = "No Options Selected: Please select your search criteria and try again"
NoInputTop.Text = "No Options Selected: Please select your search criteria and try again"
End If
When I run the code. the noinput labels do not have value, the null check seems to be failing? Please can you tell me how to display a message if the search returned no reults.
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Apr 26, 2012
How can I check if a datatable has never been set ? or Null or Nothing ? I don't mean empty Datatable ... For example,
[Code]...
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Sep 8, 2009
Dim adapter As New SqlDataAdapter("SELECT price, product FROM" & txtstore.Text & "WHERE barcode='" & txtbarcode.Text & "'", con)
[Code]...
I dont the msgbox to be sure that correct string is being passed to it and it is.. But I got an error at the "adapter.fill(txtstore.text)" saying Incorrect syntax at 'barcode'.
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Feb 3, 2006
I am trying to select a row in a datatable using the datatable.select method as described in the help files. There are several examples and here is a typical one: Private Sub GetRowsByFilter() Dim t As DataTable t = DataSet1.Tables("Orders") ' Presuming the DataTable has a column named Date. Dim strExpr As String strExpr = "Date > '1/1/00'" Dim foundRows() As DataRow ' Use the Select method to find all rows matching the filter.foundRows = t.Select(strExpr) Dim i As Integer ' Print column 0 of each returned row. For i = 0 to foundRows.GetUpperBound(0) Console.WriteLine(foundRows(i)(0)) Next i End Sub The intellisense comes up with an error on the 'select' line: "value of type '1-dimensional array of system.data.datarow' cannot be converted to 'system.data.datarow'
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May 20, 2010
I am loading data from an excel sheet using the following code.The first test I did worked fine.But when I tried another sheet it errored on a cell that was blank"Object reference not set to an instance of an object".Even though the sheet in the first test had blank cells.I need the loop to load the blank cell in the datatable
For nRow = 1 To objSheet.UsedRange.Rows.Count - 1
dr = dt.NewRow
For nCol = 0 To objSheet.UsedRange.Columns.Count - 1
[code]...
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Mar 2, 2012
i working on the update function using textboxes and a checkbox however the error arises when it gets to the check box the error is "Syntax error (missing operator) in query expression 'role_id right_id enabled_flag'." i cant see the error
my code is
strsql = "update cg_security_user_right set user_id=@field1, role_id = @field2, enable_flag=@3 where role_id right_id enabled_flag "
Dim objcmd As New System.Data.OleDb.OleDbCommand(strsql, acsconn) ' the
[code].....
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Oct 21, 2009
I want to select some rows from a sql express 2005 table. I am using this expression: "Starttime >= " & dtpStart.Value dtpStart is a DateTimePicker But I am getting this error: Syntax error: Missing operand after '14' operator.
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Jul 15, 2011
How to check whether a column is null i use the following code but I got this error "Input string was not in a correct format."
[Code]....
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Jul 16, 2009
I am using a GridView in asp.net 2.0 and I want to perform inline editing. I am using an object datasource. Because I want to use validation controls on the integer fields in my gridview, I have made them into <TemplateFields> and added a datatype validator and a range validator. This allows me to either have a blank field, or an integer value between 0 and 999.I am trying to display a "-" when the value of the property is not defined. There is no Null for an integer, so I have decided to use -1 as the value to indicate a Null.I am reformatting the to display the "-" if the value is -1. I do that as follows:
<ItemTemplate>
<asp:Label ID="lblPC" runat="server" Text='<%# FormatIntegerToText(Eval("PitchCount"),"-") %>'></asp:Label>
</ItemTemplate>
In the code behind I have defined the function FormatIntegerToText as follows:
Protected Function FormatIntegerToText(ByVal value As Object, ByVal nullvalue As String) As String
' Make sure value is not null... if so, return "-"
If value = Null.NullInteger() Then
Return nullvalue
[code]....
I though I could do the following to reformat the value that is placed in the text box:
<EditItemTemplate>
<asp:textbox ID="txtPC" runat="server" Text='<%# FormatIntegerToText(Bind("PitchCount")) %>' width="25" Columns="2"></asp:textbox>
but when I do this I get a compilation error that Bind is not a recognized function.why is this not allowed, and how can I work around it?
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Apr 6, 2009
i have a checkbox in gridview.
<asp:CheckBox ID="chkStatus"
runat="server"
Checked='<%#GetStatus(Eval("VaccinationCompletedStatus"))
[code].....
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Aug 12, 2010
I get a syntax error while trying to update a datatable using this syntax string:"SELECT * FROM ClientContacts WHERE MembershipID = '" & stringVariable & "' "
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Mar 1, 2010
I have a field in a datatable (dt) that can be integer or NULL.
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Jan 10, 2012
Here is my code
Dim dt As DataTable = New DataTable("Intervenant")
For Each column As DataControlField In grdvIntervenants.Columns
dt.Columns.Add(New DataColumn(column.HeaderText))
Next
[code]....
I am developing in ASP.NET using VB.NET as background code. I am on vs2008 with windows 7 enterprise edition.I have just restarted doing VB.Net and my first time using a gridview without a DataBase, so maybe I am missing something. Basically, I am trying to add a DataRow (dr) to a DataTable (dt) and then put said DataTable into a Gridview (grdvIntervenants).My first step is to take the gridview and put all its data into a DataTable. Then i create a DataRow(dr) that I populate with variables and I add said DataRow to the DataTable. After that, I put the DataTable as the DataSource and bind the GridView.
The problem is that my GridView shows the rows but they are empty.While debugging, I found out that this error was beside all the DataRow.Item:"In order to evaluate an indexed property, the property must be qualified and the arguments must be explicitly supplied by the user" Seraching for it on the net.I did not totally understand the error, so i tried many different ways of adding the data into the DataRow but to no avail. I also tried different way of adding the column thinking the index problem might be coming from there, but again, the problem persisted. Now, something I found weird was that the Item property of my DataRow gives the quoted error, but I see the values into the ItemArray of the DataRow.I also found out that the same error appears beside the columns property into the dataTable.When I try to access the data from the DataSource in my rowDatabound method using the DataBinder, it gives me null results...
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Mar 20, 2009
I have a gridview in my form.FirstTime in pageload iam loading gridview by calling function "FillgridFileExpenses()".
Sub FillgridFileExpenses()
If txtInvFileNo.Text = String.Empty Then
objinvoiceT.intfileID = 0
[Code].....
get dtInvoice with reflectedchanges that i made in updating in deleting?
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Jul 14, 2010
vb.net 2005
Here is one attempt:
Dim myRow As BurnerService.OEBSContractBatchesRow
Dim myDate As Nullable(Of DateTime)
myRow = Me.BurnerService.OEBSContractBatches.AddOEBSContractBatchesRow( _
[Code].....
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May 22, 2009
Did anyone knows where can I upload a folder so my programe to be able to download an update from there???
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Jun 24, 2010
I have some code which gets child items for a menu via the GetChildren function which takes a list of menuData: Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))
For Each menuData As MenuData In builtMenu
If menuData.Children IsNot Nothing Then
menuData.Children.AddRange(GetChildren(menuData))
End If
Next
If I check if menudata.children isnot nothing, it always is nothing because the GetChildren function is yet to run (providing the child items, which do exist). If I remove this check and just have this code:
Dim builtMenu As New List(Of MenuData)(_rawData.FindAll(Function(item) item.GroupingID = 0))
For Each menuData As MenuData In builtMenu
menuData.Children.AddRange(GetChildren(menuData))
Next
Then I am presented with a Object reference not set to an instance of an object error on menuData.Children.AddRange(GetChildren(menuData))
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Feb 7, 2011
I need to sort a DataTable or DataGridView by a column that is a string value, but with null/empty values at the BOTTOM when sorting ASCENDING. The DataTable is NOT populated by a SQL statement, so no order by. If I do
[Code]...
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Jun 8, 2011
I am facing a problem in inserting a datarow in the Ms access Database though visual basic application.The scenario is like this:I have a table named 'IssueReturn' for library management System. The table has these fields:
MemId Char(10)
BookId Char(10)
DateOfIssue DateTime
[code]....
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Mar 5, 2009
I need to sort a DataTable or DataGridView by a column that is a string value, but with null/empty values at the BOTTOM when sorting ASCENDING.The DataTable is NOT populated by a SQL statement, so no order by.If I doDataGridView1.Sort(New RowComparer(System.ComponentModel.ListSortDirection.Ascending))then it throws an exception, saying that the DataGridView is DataBound, which is correct, but doesn't help me, and I want to keep it databound.
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Jul 14, 2011
[code]How can I skip certain columns of the gridview? For example: Columns 1, 3 and 6.
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Aug 15, 2010
I am using VB.net.
I have a gridview with a datatable datasource.
What is the best option to update the datatable when i delete a row in the gridview and then show the gridview without that row?
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Apr 7, 2011
All I want to do is check if an object is null, but no matter what I do, if it compiles, it throws a NullReferenceException just trying to check! Here's what I've done:
[Code]...
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Apr 8, 2011
I have a dataset. I'd like to check if one item in the dataset is null or zero.
If IsDBNull(ds.Tables(0).Rows(0)("TotalCostPerUnit")) or CInt(ds.Tables(0).Rows(0)("TotalCostPerUnit") = 0 Then
Exit Sub
end if
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Sep 30, 2009
Dim Conn As ADODB.Connection
Dim Null As String
Dim NullRecordset As ADODB.Recordset
[code]....
Im trying to check my database for a null value. If the database is null, then I want it to start the timer, otherwise I want it to skip over some stuff and automatically load the main form.
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Oct 27, 2011
I am trying to check to see if a DataSet is null or not. If it is I would like to show a MessageBox. For some reason it is not recognizing null returns and skipping the message box and going right to the Else commands. [code]....
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Aug 13, 2010
I have a problem with verifying db null value. Actually I don't know the syntax.
Here is the code.
If Not IsDBNull(Me.DeliveryReviewDataSet.Delivery(Me.CustomerIDListBox.SelectedIndex).Signature) Then
"Signature" is the image field (binary data).
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Jun 29, 2010
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If MyBase.Dispose(disposing) <> DBNull.Value Then
Dispose() = DBNull.Value
[Code]....
I am getting error
1) Expression does not produce a value.
2)Expression is a value and therefore cannot be the target of an assignment.
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Sep 21, 2009
I retrieve data from database like below. How do I check whether the value retrieved from database is null?
[Code]...
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Oct 20, 2011
I am trying to create a treeview in VB.net, the data has to be loaded from MSAccess 2010 database. When I try to run this program I get error : Argument Null Exception was unhandled, 'column' argument cannot be null and the program crashes. I have pasted the code as under:
Imports System.Data.OleDb
Public Class frmRating
Private Sub frmRating_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles
[code].....
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