VS 2010 Max Number In Dataset Column
Jun 17, 2011
I'm making my own ID field (highest number + 1) and using it when I insert a row into my tableadapter, and I've tried two ways...
Ordering my dataset by ID descending and picking the first row does nothing for me.
I've tried building a datatable and ordering it descending and choosing the first row. This works great until you get to 10... Then it counts 1, 10, 2, 3, 4...
How can I make a textbox, label, etc be the next ascending number in my column Highest Number + 1?
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Nov 15, 2010
I'm writing a help application for the Customer support team at my company to help agents ask better questions when customers report problems. In it, I've got a SQL database that contains all the products, topics, and questions. The layout is similar to the following:
Products Table:
Product_ID Product Name:
Topics Table:
Topic_ID Product_ID Topic
[code]....
I don't know if I'm making myself clear, but I basically need to do the equivalent to the following SQL statement: "SELECT PRODUCT_ID FROM Products WHERE PRODUCT_Name = LstProducts.SelectedValue"
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Mar 14, 2011
When you have a single dim array, you get number of items in with simple Ubound(array). What is the most efficient way, to get number of items in each "column" in 2 dimensional array? My code (part):
.NET
Public Shared LoopStock()() As LoopStockDef
Public Structure LoopStockDef
Dim EntID As Int32
Dim LoopNo As Int16
Dim LoopType As String
Dim loopStPtX As Int32
[Code] .....
You can't Ubound multidimensional array as you can do with single dimensional array, as the second dimension can have different number of items in each column (DimX in the following table)
DimX | (1) | (2) | (3) | (4) | (5) |
-----------------------------------------------
DimY | | | | | |
(1) | 45 | 41 | 15 | 48 | 49 |
(2) | 35 | 26 | 98 | 15 | 31 |
(3) | 12 | 23 | 36 | 69 | |
(4) | 88 | | 26 | 28 | |
(5) | 74 | | 89 | | |
(6) | 36 | | 25 | | |
If you do
.NET
UBound(LoopStock, 2)
You get size of 2nd dimension, not number of items in the table for particular column. The best solution which comes to my mind is to define another array, a multidimensional counter, like
.NET
LoopStockDims() As Int16
And count every added item for each column. Is this the best way?
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Apr 28, 2010
How do I find Line 40 and column 89 in my code. I get the following error message.Error 1 Handles clause requires a WithEvents variable defined in the containing type or one of its base types. Line 40 column 89.
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Nov 21, 2011
How do I find Line 40 and column 89 in my code. I get the following error message. Error 1 Handles clause requires a WithEvents variable defined in the containing type or one of its base types. Line 40 column 89.
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Mar 3, 2010
I am trying to filter a dataset using a number different inputs, selected by a number of check boxes. I have all the text base rowfilters working, but I can not make the date filter work unless I hard code the datetime into the code. The database is MS Access and I am using VB2008 to show the data. I would like to be able to use a DateTimePicker to set the filter date (without the time part) Also I would need to remove the time section of the datEnterDate. I cannot change the structure of the database fields. Also the datEnterDate is MM/dd/yyyy, because I'm in England I would like to use the format of dd/MM/yyyy if possible
[Code]...
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Sep 5, 2010
I wrote a function to format numbers like this: 123456100,12 -> 123.456.100,12 (I have a function too, which converts numbers from this strings).Now, I have a dgv and a column with these numbers (or rather strings). The sort mode is set to automatic. If I sort the column, it doesn't work, because the values are not really numbers, but strings. But I get the same result (the sorting doesn't work), if I use the formatnumber function (this returns strings too).
I could use the programmatic sort mode and before sorting I format the strings to numbers, then sort the column, and then format the numbers like above. But this is a bit slow (the dgv has appr. 800 rows), and in this case, I haven't an arrow next to the column header text.is it possible to sort the column like a normal number-column with automatic sortmode?
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Apr 17, 2011
Is it possible to do the following rounding scheme?
36 = 40
37 = 40
38 = 40
[Code]...
I guess what I'm asking is if there's a way to find the value of the number in the ones column and tens column.
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Mar 2, 2012
I'm doing a notepad project, just because, and in Ms's notepad there is an option for a statusstrip. I'm just having probems getting the line number and I know it's not called column number, more like selection start. When I do the selection start, it works, just not how I want it to like so:
[CODE...]
but when I use that, it acts funny. I have it in my textbox's.keydown event. So if I were to use the arrow keys to navigate around text then it gets thrown off very easily. How would I do this?
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Feb 17, 2010
i am getting the xml using readxml method. And then display the data in datagrid. But number type columns comes as string type in the dataset. So when datagrid displays , sortingdatagrid columns is not correct. For example it sorts like this:
Salary
1180
12133
[code]......
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Jan 20, 2010
I have a dataset column which is "newsID".I want to get the value of it's last record so that I can use it as a default value or starting point to auto increment when I add a new record using the BindingNavigator.
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Mar 23, 2012
my application read excel file into dataset.The excel file is actually look like a report. the total column for each row is different. how to count total column for a particular row?
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Sep 15, 2010
I have a Customerdataset as follows[code]...
I want to sort it out on Route sequence and put it in the Listbox in order.may represents other numbers.So in the list box..[code]...
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Apr 5, 2010
I am making a combobox from my data source. Basically, This is a projects form and the user needs to select the the primary contact which is contrained by the customer id (GETbyCustomerID) set in another field. I have it working... mostly except the combobox only displays the contact ID which is completely useless to the user. I need to know how to display the First and Last name (both are seperate columns in the table).
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Jun 5, 2011
i tried creating a dataset using the myodbc driver 5.1 (which im sure is correctly typed in because that is the exact same connection string i used for data manipulation within my app.now, im stuck. i cannot generate any reports because the dataset i created can not return any field information w/c is confusing because it displays the names of the tables from the database. is there any way i can import all the data i need to my reports programatically??
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Jan 6, 2010
I want to insert/edit date automatically in the DateCreated column and the SystemUser column to track the date and user who entered ther details into a dataset. I am using data bindingsource to bind controls to the dataset
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Aug 7, 2010
I am a beginner to VB.net. Still learning and have a lot to learn.I am confuse on dataset and binding source.I want to update the columns in the current dataset.
I have a listbox to reorder the sequence.Once those are reordered, the sequence number should be wrote back to the "Sequence" column in the dataset.
After pointing to the current row in the binding source, I don't know how to write back to the column.[code]...
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Mar 16, 2010
I have a dataset that is being populated from a text file.
OrderNumber,Name,Model,Cost
123,john doe,product1,20.99
123,john doe,product2,10.75
There can be multiple of the same order number. In the dataset, I want to have a column "line number" and I want to put in it the value of the linenumber (in this case 1 and 2) per order. In sql , I was able to accomplish this by inserting rownumber() and grouping by order number. Can this be done in .net?
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Aug 21, 2011
it's possibly to bind the values in a combobox to a column in a dataset? If so, how would I go about doing it? For example, If I have a column named 'Names' in a DataSet, each comboBox item would be a name from that column.(There will only me at maximum, 10 entries)
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Mar 28, 2012
I've googled but can't find a awnser to a problem. I've made a vb.net application in VS2008 with a dataset in it. I want to store a column with format date in the sqlite database.[code]...
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Sep 30, 2011
I have a ComboBox with its datasource being a dataset from a SQL Server database.
The width of its columns are relative to the width of the name of the columns. I would like to increase that width in order to see the content properly and not cuted.[code]...
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Jun 9, 2011
I have a combobox which is populated from a dataset (pulling values from the column Actuator_ID). When an item is selected from the combobox, I need to return another value from the dataset (column Gateway_Channel). In the 'selectedindexchanged' sub, I have the following line which should return the value from the second field (gateway_channel) but whatever item is selected in the combobox, only the value from the first row is returned.
errBox.AppendText((ds.Tables("Actuators").Rows("Actuator_ID" = ComboBox3.SelectedItem.substring(0, 2)).Item("Gateway_Channel")).ToString
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Mar 17, 2010
I have a dataset and want to know the data type of a specific column. The GetType returns datacolumn not string or integer etc.iggy!
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Sep 3, 2011
Just trying to work out how to build the list from a seperate column in a linked datset to a checkboxlist, the same way as you can with a combobox?
So you can take the dropdown list for the combobox from another column and I thought it would be the same for the checklistbox but it does not seem to be an option.
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Mar 14, 2009
I want to apply culture setting for a dataset column. I use Icelandic regional settings where the currency format is as such :
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Oct 4, 2009
I have a table with two columns (id and number1). How can i get from the datagrid or the dataset the data of one column (number1) in one variable?
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Feb 8, 2012
I need to read data from an Excel sheet as part of a data conversion. Certain columns contain mostly numeric data but may contain some alphanumeric data somewhere in the excel sheet. The problem is, my conversion sees the alphanumeric values as null (or blank. Using the .ToString() method returns ""). To connect to Excel, I'm creating an oledb connection, creating an OleDbDataAdapter, then filling a DataSet with the adapter.
Here's the VB code for connecting:
private _oleadpt As OleDbDataAdapter
private _oleconnection As New OleDbConnection
Dim olecomm As OleDbCommand
'_database comes from a settings file and is the full path to an excel document
Dim connstring As String = "Provider=Microsoft.Jet.OLEDB.4.0; Data Source=" & _database & ";
Extended Properties=""Excel 8.0;HDR=YES;"""
[Code] .....
I think the data adapter is determining the datatype for the columns based on the first however-many rows it looks at. It decides the columns with numbers are numeric which is the start of my problem. Changing the formatting of the column in Excel doesn't seem to affect the datatypes in my data set. Is there a way to tell the dataadapter or dataset what type of data to use for a column? Or should I try to cast the data in my SQL statement?
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Feb 2, 2009
I have a dataset with numerous tables.I have changed the column type of a couple of columns in the source DB form smallint to int.No I need to update the datasets (and eventually the code) to the appropriate datatype.Rather than hunt around the dataset and find all the places where these columns are referenced is there a way to direct the dataset to go back to the DB, reread the queries and update the datatypes.I know I can either change the field or one by one go to each table and force it reread the query but I want the dataset to do it in mass.
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Apr 1, 2009
I would like to iterate through a dataset and obtain values of each column in a row
[Code]...
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Sep 19, 2009
I have a dataset column that I am keeping comments in. If the row has no comment in it(defualt string value is "", not NULL), I don't want it to show up on my report. How can I fill only the datarows that have text in them and not the ones that are empty. I've tried to filter the columns results by Not Nothing, but everything shows up. I'm guessing because it's actually not NULL since the string is "". How can I filter these results correctly?
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