I am using VB.NET and ADO 4.0. Given that I have a string containing a reference to a table.column, can I use the content of the string in a command? [code] I got to the point where I can use the string contents as "reference", it seemed to obvious but [strName] does the trick, partially.When I debug bookableday.room1 remains 0 whilst it should show 6. There might be a conversion issue because the debugger shows me "6" i.s.o. 6 . this is the actual code: [code]
I have two tables, dt & dtResults.dt contains 3 columns named: vchInstrumentAnalyteID, bintAnalyteCodeID, & vchAnalyteCode dtResults contains several columns including the columns in dt
I want to get vchInstrumentAnalyteID from the first row in dt and test if it exists in the vchInstrumentAnalyteID column in dtResults. If it exists, I want to use that value from dt to filter rows in dtResults and fill all the filtered rows with data from that row in dt. Then loop to the next row in dt.
I have this code, which is close to what I need, but I can't get it working.
' put analyte data in results table For Each drA As DataRow In dt.Rows If
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
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.
I'm trying to load a datable into a datagridview, but column1 ("date") should be converted to a datetime, so I can sort it when I click on the datagridview header. I tried this, but it gives me that there is no column 0 or one. I have 2 columns: "ID" and "DateStart"
I have an application that users will save a list of clients to a database. The extension on the database is .sdk, and I think is some kind of sql database. The user can save rows and add rows to maintain a client list, but when I release an update, I have to install it without the database file. If I install with the database file, then their current client database is replaced with a new blank database.
my issue is that I need to add columns to tables in their existing database without overwriting their current rows. For example, i have columns for client name, address, and phone number currently. On my next update, I want the user to be able to save client birthdays. Here is what I have:
I have a Datatable with one column of the table being 'PartNum(product part number)'. I used EntriesTable.DefaultView.Sort = "PartNum ASC" to sort the whole Table, with respect to the information in this column. Now I'm just trying to further sort the table by grouping rows that have same info under that column together and do something to each of such groups. but I'm kinda stuck here.
I'm thinking of creating some sub-DataTables out of the original one and have these sub-tables to hold those rows with same info under "PartNum". Does anyone have ideas how to do that? maybe with DataReader or DataView ,
I have a datatable which has 5 column. It is possible to copy only its 2 column in and save it into new datatable.I used this code but it copies all the 5 column
Code: Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _ Select obj).CopyToDataTable i used this one but it is not supported
Code: Dim qry As DataTable = (From obj In temptable Where obj.Item("Column1") = 0 _ Select obj.item("Column1"), obj.item("Column2")).CopyToDataTable
I have three sub tables that I want to process. For each I want to combine the rows, as they are only different by contents in the second column(I want to do the same to the fourth column, later):
I have a data table, i want to add a new column on that table, the data in that new column will depend in the data from another column. Now i can think of two ways to accomplish this, first is loop through the whole table and do the statements to get my new columns appropriate data. the second approach would be to give the new column an expression, then convert the table to xml (to remove the expression) then convert the xml string back to datatable.
Now, is there any other way around this? what could be the most optimized way in solving this task?
After Filling a DataTable in GridView's DataSource . A column with check box Type appears but it created as read only column and I can't enable it or make it editable... even i tried .readonly = false and still can't be edited
I am working on a project that takes an xml schema and xml data files and places them into a DataTable, the 2 files are generated from a working table that i have written to disk. I wish to load these 2 files into a DataTable. Here is What i have
vb.net Friend Function CreateTable(ByVal tableName As String) As Boolean Dim table As New DataTable(tableName) table.ReadXmlSchema(tableName & ".xsd")
[code]....
this however produces the following error on line 3
Quote:
System.ArgumentException was unhandled Message=DataTable 'get_item_list' does not match to any DataTable in source.
get_item_list is the parameter passed into this function (tableName)
I have a datatable that has a resource in one field and hours used in another, it looks like this -
Resource Hours Used Manager 1 Accountant 1 Field Staff 2 Accountant 3 Manager 4 Manager 1 Administrator 6 Field Staff 4 Manager 0.5 Administrator 1
What I want to do is be able to create a summary of the data table above that groups multiple occurrences of a resource and adds up the hours used for that resource, creating a summary that looks like this -
Resource Hours Used Manager 6.5 Accountant 4 Field Staff 6 Administrator 7
I have a string say, str = "system.Int16" I want to add a column in DataTable say, dt = new DataTable()I want DataType for that column as per 'str', i.e. System.Int16 Then How to? dt.Columns.Add("MyColumn", ...)
I have a sql stored procedure that returns a certain group of columns in my datatable. How can I move (let's say) the column in the first position, to the last position before I export the datatable to excel ?
Dim myConn As New SqlConnection(strConnection) Dim myCmd As New SqlCommand(strSQL, myConn) Dim dt As DataTable = New DataTable() Dim da As SqlDataAdapter = New SqlDataAdapter(strSQL, myConn)
I have a csv file that comes in I put it into a dataset and do a little manuipulation of the appearance of how the data is presented and then I put it back out into a different csv file that our 3rd party application will except. I was importing it into SQL Server and then doing a select statement to grab the data back out in the format I required. However I'd really like to eliminate the need for the SQL Server use.
So my question is how do I add in the 1st column of a CSV file the column name "KC" with a value of "1" there will only be 1 rows worth of data, mind you it's 55 columns long but there is nothing I can do about that, it's the way it has to be.So do I do this in the DataTable or when I create the CSV file? And how do I do this?
I need to limit the amount of columns being returned from a datatable from 14 to 5 or 6. Date, Hour and 3 to 4 decimal columns. Is it possible to do something like a SQL 'Like' to specify which columns I want?
So i create a datatable from a table i can't directly view(i.e. using sql server management). I want to find the column names that are in the datatable, what would be the correct way do this?
Dim s = (From rowItem In i.AsEnumerable() _ Select rowItem("COUNTER")).Sum()
I'm trying to Sum all the value in column 'Counter' in my Datatable. 'Overload resolution failed because no accessible 'SUM' accepts this number of arguments.
My problem is that i want to use the Compute method for a datatable.[code]The name of the column of that i want to sumarize is 2012, but it seems that the compute method doesn't recognize it as a column and throw this exception Syntax error in aggregate argument: Expecting a single column with a qualifier 'Child'.It is not possible to me to change the name of the column, what can i do in this case to sumarize the datatable and save it in a variable
I have following codes str2 = "select sno,name from employees where sno =" & Val(Me.TextBox1.Text) cmd2 = New SqlClient.SqlCommand(str2, con) da2 = New SqlClient.SqlDataAdapter(cmd2) dt2 = New DataTable da2.Fill(dt2) Now dt2 has two columns as sno and name But I want to add a 3rd column city type char(80)
i'm trying to get my program to look up a string and find a match in an access database in column "PhoneNumber" and return the value from column "FullName" on the same row to a different string
so it would go like this: (i really don't know much about accessing databases)
Dim PhoneNumber As String Dim FullName As String PhoneNumber = TextBox1.Text FullName =
