I have a dataset that I search using the
dataset.tables("table").Select("WHERE clause")
method to query. I then use a datarepeater to display the results. Is there a way to programatically tell if no results are returned? I'm aware of the Dataset.tables.Rows.count, but can this be done after the select method?
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MsgBox(MyDataSet.mytable.Rows.Count)
Gives 0, why?
The table has data!
i have a sql database, and have created a dataset for a sample table in it.The dataset is HotelDataSet2 and data table adapter to insert to it is Various_itemsTableAdapter.
MsgBox(HotelDataSet2.various_items.Rows.Count)
Various_itemsTableAdapter.Insert(Item_nameTextBox.Text, itemcode, PackingTextBox.Text, UomTextBox.Text, PriceTextBox.Text, RemarksTextBox.Text, TaxTextBox.Text, StatusCheckBox.Checked, Rate_inclusiveCheckBox.Checked)
MsgBox(HotelDataSet2.various_items.Rows.Count)
This always reflects the same count, before and after inserting..But if i execute this
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it shows the new count to be +1 of the old one. So i concluded that everytime i change some data to the table via table adapter, i have to always refill the dataset?? How is that useful then??
I have a Windows form that has a datagridview on it. I populate it with records from a database. I have a checkbox on each row. Then I have a textbox on the form outside of the datagridview. Each time a checkbox is checked I want to count it and show it in the text box. Each time a checkbox is unchecked I want it to subtract the count.
View 2 RepliesI have a fair bit of experience with VB.NET and C# (In this case I chose VB.NET, blame my laziness), but I do most of my professional work using PHP. I have no experience what so ever in using any database with VB.NET let alone MySQL.Just FYI, at the moment I am only trying to Query the database to gather the information required to activate. The Activation wizard and algorithm building (which is finished anyway), and everything else will come soon. I chose the MySQL database because I have experience with it, and it seems the best option for remote usage.The whole idea already works in PHP, I'm just have major issues moving it accross into VB.NET (Using the MySQL Connector.NET);I understand the basics, and all I need to know how to do is Count Rows and gain access to the other information in a row based on provoided information (in PHP, through mysql_ result)
So, here goes nothing, this is the Query code I am using in PHP to complete the job I want to do in VB.NET. [code] As you can see, I basically need to get the PHP code into VB.NET to fit into the 'btnQueryDB.Click' Command in VB.NET. By Equivalent, the Product ID in VB.NET will come from 'txtPID' and similar, Serial Number will come from txtSNUM. Once counted to be 1, the Activation Code and Status will be fed into 2 other text boxes in the form. (acCode, and acStatus).
I have added a column to a Datatable called CallsPerDay which is there to tell me how many telephone calls have been made on a particular day or days.Is there a datacolumn.expression which will allow me to Filter on the day, count the rows and then populate this added column with the result.
View 1 RepliesDeclare some class level variables that will keep track of the sums for each column. For example:
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During the RowDataBound event, retrieve the data from each column and add it to the appropriate sum. I'm not sure if you are developing an ASP.NET application or a Win-forms desktop application so I cannot help you any further at this point. What have you tried so far to solve the problem?
I have a requirement where I have to add items into a List(Of T) (let's call it Target) from an IEnumerable(Of T) (let's call it Source) using Target.AddRange() in VB.NET.
Target.AddRange(Source.TakeWhie(Function(X, Index) ?))
The ? part is a tricky condition that is something like: As long as the as yet unenumerated count is not equal to what is needed to fill the list to the minimum required then randomly decide if the current item should be taken, otherwise take the item.Somethig like...
Source.Count() - Index = _minimum_required - _curr_count_of_items_taken _
OrElse GetRandomNumberBetween1And100() <= _probability_this_item_is_taken
' _minimum_required and _probability_this_item_is_taken are constants
The confounding part is that _curr_count_of_items_taken needs to be incremented each time the TakeWhile statement is satisfied. How would I go about doing that? I'm also open to a solution that uses any other LINQ methods (Aggregate, Where, etc.) instead of TakeWhile.If all else fails then I will go back to using a good old for-loop =)
i have datagridview with rows in it and one of the col show type of product. there are row with same type. on click of button i want to select all the row where productype = 1 (for example)
do i have to go thru each row in grid and check the condition for product type and then select it or there is another quick method.
Vb.net I tried to rearrange the DGV Rwos but I don't know how to complete it. as it show in the code ( my request in green line)
vb
Public Sub rearrange()
For Each row As DataGridViewRow In Form1.DataGridView1.Rows
If Not row.Cells(1).Value Is Nothing Then
[code]....
I've populated my DataTable will all the results from a SQL search. Upon a button click I want to populate a combobox with all the results where a condition is met. My DataTable as a column called UserID and I want to add all results where the UserID is equal to a set value (for example 12). I can do this to add all results and I guess I could add a if statement inside this to be If Entry.Tag = 12 Then but is there a better way?
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I have a problem saving a dataset which contains rows that i have imported from another dataset. i can successfully view the imported rows in a gridview but i cannot commit the rows back to the database.
View 2 RepliesI have a mvc 3 app that uses EF. In one function I need to get a count of rows that match a statement. I thought I could just do it like this:
Dim _ClassCount As Integer = _CurrRegistrants.Where(Function(c) c.tues_class = _CurrCourse.course_ref).Count
But that stays at 0 even when there are 40 records that match the criteria.. I think I have the right idea I just need to change the syntax a little..
Dim _CurrRegistrants As List(Of reg_classes) = db.reg_classes.ToList
For Each Course In _courses.Where(Function(a) a.course_day = "Tuesday")
Dim _CurrCourse As cours = Course
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i want to change iC to make iC.Value but how?
For iC As Integer = 0 To DataGridView1.Columns.Count - 1
For iR As Integer = 0 To DataGridView1.Rows.Count - 1
If DataGridView1.Columns(iC).Name = "mode" Then
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I have hide some data in datagridview. When i write datagridview1.rowcount-1, it will count all data no matter is visible or invisible. But i only want to count data that display in datagridview. How to do??
View 3 RepliesHow to count how many rows include in DGV ?
View 3 RepliesHere is some code that I used to fill up my DataSet.[code]...
View 9 RepliesI need to count how many instances or rows there are which have a specific value in one of the columns.
For Example:
the column "Ready" is a YES/NO column in Access.
If 5 rows have that set as YES and 7 have it as NO
how do i count how many have yes's and how many have no's
This is mainly for the purposes of statistics
I have a VB report which contains a list of locations. I have this list separated into areas and I need to count the total number of rows per area section. I have a groupHeader which contains my area field, then in the group I list the corresponding entries for that area. Then in the groupFooter I would like to give the total number of entries in the group. How can I do this? I have two fields in my groupFooter
groupCount
groupTotalAmount
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click[code]...
it checks the username and password in the database and redirecrs to respective page on the basis of rows returned. i'm having problem in finding a right function in the sqldatareader namespace so that it counts the number of rows affected.
I want a macro to sort from A2 to xlLastCell on a sheet where the user will paste-in same-column but different-length data each month.I've just spend over 2 hours searching and found some neat code [and used some of what I found] but still have this question:How to replace E6191 with E(TotRows) in the below code? [code]
View 1 RepliesI use: Dot Net 2003-Window Application
In my form there is a Data Grid. When the datagrid is populated, I like to display the total number of records in the grid and sum of a particular column of the grid. Is there any method to be invoked?
i have a table name employee_log...and one of the column name is enroll_no...i just want to count the number of rows of that table ....and display that result ie integer value in textbox..... i used count function but i dun the syntax...
View 2 RepliesI am looking for a fast way to count the rows in order to make a unique primary key to save in the database.I used to count the rows but it needed an sqladapter, a data set and then an integer to count but is there any short way to just count the number of records what are in my SQLcommand.[code]
View 10 Replieshow I would count the rows in an excel document until a row has no text. For example:
A1 has a value of 1
A2 has a value of 2
A3 has a value of 3
A4 is blank
So what I want is to count the rows until there is no value. For this example it would stop at A3 because there is no value in A4
i try to print data but when i put this code ..my data is repeated example[code].....
View 4 RepliesI got an application with a binded Data Source and im trying to display how many rows in the DataGridView are present in the dialog title like
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I am having trouble Counting the number of rows in a specific column in a datatable.
View 2 RepliesI have a button that is supposed to display a form:
Code:
Private Sub btnEditAssociate_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnEditAssociate.Click
frmEditAssociate.ShowDialog()
End Sub
Code:An error occurred creating the form. The error is : index 0 is either negative or above rows count.There is a database call on the form load property of that form, so the problem could be with that, but the when I step into the showdialog() call it produces that error on the show dialog line, so I can never see what is going wrong.
I have a report with a dataset that has a column with booleans. In the table footer I want to display x / y where x is how many rows that were true and y is how many rows there was total.
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