DBNULL Error In Data Grid?
Nov 9, 2011I am recieving this error on this line
ctl.Value = CType(Me.Value, DateTime)
Conversion from type 'DBNull' to type 'Date' is not valid.
I am using Data Grid View and This is a calendar Type Column
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Double Click Data Grid Header Error?
Feb 15, 2012i have a data grid,, connected in ms access via code, on its celldoubleclick event i have the code
Public Sub dgv1_CellDoubleClick(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellEventArgs) Handles dgv1.CellDoubleClick
Dim empid As Object = dgv1.Rows(e.RowIndex).Cells(0).Value
[code]....
Keeping Data In Grid While Displaying Error Message
Mar 5, 2009I have 5 textboxes embedded in a datagrid that require a date format (mm/dd/yy), but can be left empty if user doesn't have date. User can poplutes these textboxes for multiple records and hit submit button. On the submit i loop through the grid. If dates are populated AND they are in the correct format then I call a stored procedure that inserts the record into a table. If any of the dates that are populated in the textbox is not a date or in the incorrect format I need to display error message in a label. I got all this to work, but if it throws error message all the data in the grid is wiped out.
How can i keep data in each textbox and still display the error message?
DBNULL Error In .NET?
Nov 9, 2011I am receiving this error on this line
ctl.Value = CType(Me.Value, DateTime)
Data Grid View Header Grid Color
Jan 14, 2010This is a VB .NET application where we are showing the output of a SQL statement in a Datagrid view. using .NET 2005.We need to get the seperators of the headers on the grid control to be the same colors as the GridColor on the form. See the picture below:We've tried looking through all of the properties of the DataGridView control, and found some interesting things that looked promising such as the DataGridViewAdvancedHeaderStyle, and DataGridViewHeaderBorderStyle, but none of it seems to allow you to change the colors on it.Does anyone know how to do this without remaking the entire thing with a GDI+ control?
View 2 RepliesAutomatically Put A Data Grid Row Column In A Data Grid?
Jan 8, 2012Is there a way to automatically put a Data Grid Row Column in a data Grid?[code]...
View 5 RepliesSilverlight Data Grid With Grid Splitter?
Oct 13, 2011I have the below code that i am trying to have two datagrids with a grid splityter in the middle. The split seems to be working fine but the issue i am having is when I populate the datagrid it is growing in height and changing the splitter instead of leaving the height alone and adding scroll bars.
What simple thing am I overlooking?
<Grid x:Name="gdHistory" Grid.Column="0" Grid.Row="2" >
<Grid.RowDefinitions>
[code].....
Getting Error With DBNull When Using LINQ To DataSet
Nov 12, 2011I've got the following LINQ Statement:
[code]...
invRecord.Pack_Num is a field of type Integer. This means that when I try to access it, if it is DBNull I get a StronglyTypedException. The above code throws this exception. If, however, I remove the "invRecord.Pack_Num = PSNum" and in its place put something like "True", the code works fine. So I guess my question is, why is that that invRecord.IsPack_NumNull() returns False when the value is in fact DBNull and what can I use as a conditional instead? I've been beating my head against the wall for a while now and I can't find a solution to this problem.
Populate Listview And Getting A DBNULL Value Error?
Jun 5, 2010Im trying to populate my Listview and im getting an DBNULL value error. Ive tried the following code but it doesnt work.
Me.SpMainSearchTableAdapter.Fill(Me.CapitalVisasCRMDataSet.spMainSearch, Me.tbxSearch.Text)
Me.lsvSearchResults.Items.Clear()
[Code].....
.net - LINQ Error Type DBNull Column?
Apr 29, 2011I am querying a datagridview and it works great unless one of the cells has nothing (dbnull). How to over come this?Exceptions: Operator '=' is not defined for type 'DBNull' and type 'DBNull'.
Dim query = From row As DataGridViewRow In DataGridView1.Rows _
Where row.Cells(SelectedColumnIndex).Value = filter _
And row.Visible = False _
Select row Distinct
DBNull Error - Return Formatted Date
Mar 20, 2012I have dates I am reading from a database, when I format the dates and there is a blank date I have a dbnull error...
What is the correct syntax to say
IF txtOrderDate = DBNull
then
txtOrderDate = ''
ElseIf
txtOrderDate <> DBNull (return the formatted date)
' Populate Header
[Code] .....
SQL Update Statement - DBNull Error With Replace?
Apr 22, 2012I am creating a form that is able to update data in SQL server after selecting an MS Access file (.mdb). I am having an issue where the data has a single quote ('). I found out that the solution was to use Replace() - to replace the single quote with two single quotes - Replace(string, "'", "''").Now, for some reason, I am getting an error "Conversion from type DBNull to type String is not valid." Here is the code.
cmd = New SqlCommand("Update Child Set " & _
"TopLevelProject = '" & row("TopLevelProject") & "' ," & _
[code].....
VS 2005 Exporting Datagridview To CSV - Dbnull Error
Jun 9, 2010** Edit - just thinking - I have this export code elsewhere in my application; testing it with blanks works fine. All the fields in the two forms are text fields. The only difference that I can see is that the form that is causing me a problem is based on a left join query from my database; the form that works is based on a flat table. Any ideas???
I have tried everything in my (very, very limited) knowledgebase for VB and am completely stumped. I'm sure the fix is simple, but no clue where to go. (I got this code from a site which I didn't make a note of, and cannot find it by doing a google search)...
The code listed below is supposed to export a datagrid view to CSV. It works fine - if, and only if - all the fields are populated. If one of my columns is blank, then I get a ""Conversion from type 'DBNull' to type 'String' is not valid." error. **Edited to provide exact error message
The code that's giving me a problem is the second IIf(intRowData < intColumnCount, strDelimiter, "").
[Code]...
Combobox Giving 'DBNull' Error When The First Item Is Chosen
Oct 5, 2009I am using combobox to populate values from a table, 'Suppliers'. I put this combobox in a form wherein the order details are filled up. This column 'Supplier' is a Foreign Key and set to NotNull in the order detail table. Selecting the first available entry on the combobox gives error 'SupplierID cant be Null' . Selecting the 2nd value is OK, first choosing 2nd and coming back to 1 is also OK. This error comes up when trying to update the database.Even with the first value, the combobox is having a text. I would like to know why the error.
View 5 RepliesVS 2008 - Excel And Data Grid - Importing An Excel Into A Data Grid - Receive The Value "null"
Mar 10, 2010I have a problem with importing an excel into a data grid.
Here is my code:
Try
Dim _Obj As New ExcelConnection.ExcelConnection
_Obj.ImportAttendence("c:Info_pc.xls", DataGrid1)
Catch ex As Exception
End Try
In the excel i have numers and text and "Service Pack", "Processor Speed" and "Numar procesoare(Number of processors)" and the values for these are numers. in the data grid when i import the excel those values doesn't appear, i receive the value "null".
Transfer All Records In 1 Data Grid View To Another Data Grid View?
May 9, 2012I have 1 datagridview and i want to transfer all records to another datagridview, how can i possibly do that. Newbie here. This is my code in transferring 1 record to another datagridview to another one.
[Code]...
Check For DBNull In SQL2008 Data Field?
Jun 30, 2010I'm using VS2010 and SQLServer 2008. I'm trying to test for DBNull in datafields, but every formulation of a test I have imagined (or found) throws an error. Specifically,"The value for column 'ColumnName' in table 'TableName' is DBNull." (system.data.strongTypingException).Well, not too helpful. I know it's DBNull, and I want VB to recognize this.Here is what I've tried so far (all with the same result).
[code]...
Handle DBNull Exception While Reading Data From Database?
Mar 22, 2012I'm trying to handle DBNull exception while reading data from database. It's my code:
...
Dim SQLRDAs SqlDataReader
...
val1= GetStringFromDB(Trim(SQLRD("Name")))
val2= GetStringFromDB(Trim(SQLRD("Level")))
[Code]...
But still I get Conversion from type 'DBNull' to type 'String' is not valid. error.
Combine 2 Data Grid View Into 1 Data Grid View?
Jul 15, 2009how to cambine 2 data grid view into 1 data grid view
View 2 RepliesVB - Simply Link A Data Grid View To Display Data That Was Selected From A ComboBox?
Oct 14, 2010I just want to display data in a DataGridView (from SQL - already made the connection) based on what is selected in a ComboBox (data that is also coming from SQL). The 2 are separete on the form. I am using VB 2010.
This doesn't work for me:
objCommand2.CommandText = "SELECT ProductID, Name, Color, Size, ListPrice FROM SalesLT.Product WHERE ProductCategoryID = " & cbCategory.SelectedValue
[code].....
Office Automation :: Populate Access Data Table To Data Grid?
Nov 11, 2010The control comes up blank??Imports System.Data Imports System.Data.OleDb Public Class Form1
[Code]...
Saving Data From A Data Grid To An Access Database (2008 Express)?
May 18, 2010I'm trying to create a simple Data Grid that will automatically save changes. So far I have a data grid connected to a MS Access 2007 Database that reads the data. I can create new fields in the Data Grid, but I need to program to save the data automatically to the database on update (or on close).
View 6 RepliesDisplay Excel Data With The .xlsx Exstension In Windows Application Using Data Grid View?
Sep 28, 2011I have an excel file that I would like to load into my form and display there.
View 1 RepliesForms :: Display Data In Grid View Using Code That Can Edit, Update And Delete The Data?
Oct 6, 2011how to display data in grid view using code that you can edit, update and delete the data...do i need to have a stored proc in this?
View 4 RepliesError - Operator '=' Is Not Defined For Type 'DBNull' And String "test"
Feb 23, 2010I have the following query
Dim get_rmf_2 = From rmf In t_rmf _
Where rmf!NIVP = nivp_rap
When i run it i get an error :
Operator '=' is not defined for type 'DBNull' and string "test".
I suspect this is because the column "NIVP" in the datatable contains null values, I've tried yhe same thing without null values and it works.So how can i make this work ? ; the column "NIVP" really has a row "test" , and a normal SQL query works fine.
ERROR "The Value For Column 'Type' In Table 'Fields' Is DBNull"
Feb 8, 2010I have error. How I can fix this? My error message is "The value for column 'Type' in table 'Fields' is DBNull."
Dim adapterFields As New _MyDatabase_1DataSetTableAdapters.FieldsTableAdapter
Dim fieldsRow As _MyDatabase_1DataSet.FieldsRow
For Each fieldsRow In adapterFields.GetDataByCategory(Me.ComboBoxCategory.SelectedValue)
msgbox(fieldsRow.Type)
Next
Forms :: Error - Conversion From Type 'DBNull' To Type 'Date' Is Not Valid
Oct 10, 2010I'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?
VS 2008 : Error: Conversion From Type 'DBNull' To Type 'String' Is Not Valid
Jun 15, 2009how 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.
.net - Finding WinForms Data Grid And Data Editor Controls?
May 15, 2011Are there any good free alternatives to DevExpress data grids (WinForms)?I am looking for WinForms Data Grid and Data Editor Controls.
View 1 RepliesData Binding - Update The Grid Data By Reading The Array
Apr 2, 2012Data binding should be an extremely simple thing to manage but I can't find a SIMPLE solution to the following problem.
I have two forms
Form1 contains a 4x4 MSFlexGrid (unfortunately an unmanaged COM object but I can merge cells, which I can't do with a managed Datagrid)
Form2 contains other controls which change the data in the Flexgrid.
I connect the two with a Public 4x4 array. Form2 changes the data in this array. I can update the grid data by reading the array. But how do I bind the Grid to the array so that it auto-updates - which is the whole point of binding isn't it?