Removing Duplicate Rows In A Textfile Then Add To Datatable?
Aug 16, 2010
I am reading a textfile and extracting information from each line. For example string1 and string2. I am then writing these string to a datatable.
However, sometimes there will be repeats in string1 and string2.
If there are repeated lines I would like to be able to delete the repeating line and add a counter to find the total number of repeating lines.
so if a string repeates 3 times I would like there to be a column with a 3 displayed next to the line in my datatable.
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May 16, 2012
How do i read through a textfile line by line checking for and removing duplicate values?
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Jul 5, 2011
Using the following DataTable:
Dim d As New DataTable()
d.Columns.Add("Product", GetType(System.String))
d.Columns.Add("Value", GetType(System.Double))
[code]....
I'm trying to use LINQ to identify if there are more than one of any type of product. In SQL, this would work something like:
SELECT Product FROM SOME_TABLE HAVING COUNT(*) > 1
I can't for the life of me work out how to do this in LINQ. I was following someone who did something like this:
Dim q = From row In d.AsEnumerable()
Group row By New { column1 = row("Product"), column2 = row("Value") }
Into grp
[code]....
But I get an error when I try to actually use 'q'. how I can make this work?
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Oct 26, 2010
I have to extract from a text, group letters (2-by-2 characters), for example : from this string : "THIS IS SOME" => THHIISS IIS
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Aug 8, 2011
I have not had much time to go threw my code properly as this is some urgency. I need to remove line 1 from a textfile if it contains a string but its not working.I have 500 files and not going to do this manually.
Code:
Private Sub btnRemove_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnRemove.Click
If String.IsNullOrEmpty(txtDirectory.Text) Then
OpenFolderDialogDirectory()
[code]....
I also feel the function is very pointless sime i am opening the file twice.
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Oct 31, 2009
I am populating a combobox with data from a .txt file; however, there are 1000 entries but only 4 different possibilites 1, 2, 3, and 4. How can I have the combobox only allow a selection of the 1-4 with repeating all 1000 numbers?
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Feb 5, 2010
im using an open file dialog ot add files to my program, im using the code ISO_FILES.Text = ISO_PICKER.FileName //FYI Iso_Files = TextBox & IsoPicker = openfile dialog but this wont just add the file name it will ad the folder path and the file extention,
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Jun 10, 2011
I have been working on a pythagorean theorem calculator and am actually stuck on the final bit of code. What I am trying to do is check the values (integers) inside a listbox, remove duplicate number (both values), and input one of the values into a textbox.
Here is an example of what I am doing:
LISTBOX VALUES
2
2
3
[code]....
When the program runs, check listbox value #1 and listbox value #2, if listbox value #1 and #2 match (2 & 2), input that value (not both duplicates) into a variable, remove both of the duplicate values, continue checking the rest of the values, and finally multiply the leftover values. I am sure that sounds confusing. Here is what the final output will look like
LISTBOX VALUES
3
7
[code]....
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Aug 30, 2010
I was generously guided by the community to use LINQ to find duplicates on my listboxes the last time around. However, I am now in a tough spot because I need to find and remove duplicates from a multicolumn list view. I tried using LINQ but it says that the listview object is not "queryable". Is there a way for me to find and remove duplicates using only one column of the listview? [code]The code now runs fine when I call it. But it does not remove the duplicates:
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May 8, 2012
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):
'Sub table 1
xx|C201 |02300877 |Samsung |....
xx|C201 |02300877 |Toshiba |....
xx|C213 |02300877 |Samsung
[code]....
p.s. For the fourth column, Manufacturer information , I want to do the same and I'd probably get something like this for the final table:
xx| C201,C213,C606,C619 |02300877 | Samsung
xx| C201,C213,C606,C619 |02300877 | Toshiba
xx| C303, C305,C712 |02301163
xx| C207, C209, C708 |02301165
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Jun 5, 2011
what i need to do is to get some data from sqlserver and send it to a dataset(no problem there) after i get the dataset filled i need to send the columns and rows to a textfile but i have to separate the columns on the dataset with this "|"
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Apr 14, 2012
Dim _tableBackLogs As System.Data.DataTable
Do While i - 2 > 0
_tableBackLogs = Global.DataAccess.GetDataTable("SELECT SubjectID,SubjectName,Grade FROM SubjectPI WHERE RegNo='" & CInt(HttpContext.Current.Session("userName")) & "' AND Status='Fail' AND Semester='" & i - 2 & "'")
i = i - 2
Doing this replaces the previous data in the DataTable. I want to retain the previous data i.e i want the new rows to be added to the DataTable w/o replacing the previous rows.
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Feb 16, 2012
I have a datagridview with rows and 2 columns the first for staffname the second for the price the first column name is "staff" the second is "price" I want code count's how many time the row have been repeated to count the item price
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Apr 8, 2010
My browser application has an option to display all the "href" elements of a web page in a datagridview.
I use the code below to populate the datagridview.[code]...
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May 26, 2008
I am looping through a file and I am populating a datagridview with values. I have this part done, and it works just fine. My problem comes in when I try to remove duplicate rows from the DataGridView. I would like the code to increment a cell if a duplicate row is found and then remove the duplicate cell. For instance if the program comes across 2 instances of "duplicated value" in the DateGridView, I would like the second instance to be removed and then a value of 1 added to the first instances row, 4th column. I understand most of it, but I just can't get the darn loop(s) working correctly. Iguess my theory is to compare the first row to the last row. if there is a duplicate, then remove the duplicate and add "1".Then I should move onto the next item from the top. This would loop until all items have been checked. I have been messing with this for a while now and I just keeps getting worse.
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
Dim col, row, MaxCount, x, y As Integer
[code]....
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Aug 26, 2010
If I have an unbound DGV with hundreds or thousands of rows what is the easiest way to find any or all duplicate rows? ie. where the data in all the columns is the same in 2 or more rows.
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Sep 22, 2009
I am populating the list view using mysql and i dont know how to avoid duplicate rows.
Private Sub Btnrefresh_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnrefresh.Click
Using connection As New MySqlConnection(";")
Using command As New MySqlCommand("SELECT Distinct name, type, uploaded, uploader, location FROM programs", connection)
connection.Open()
[Code] .....
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Jul 26, 2010
I have this code:
If kivertekhossz = 2 And dgvszamlatukor.Rows(ind).Cells(1).Value.ToString.Length > 2 Then<br/>
dgvszamlatukor.SelectedRows(0).Cells(0).Value = My.Resources.S_CLOFOL<br/>
[code].....
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Jun 30, 2010
I'm going nuts with this. Obviously I cannot open the reader ard writer on the same file simultaneously.
[Code]...
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Jan 16, 2011
Having problems with a datatable which consists of multiple datalogger information. Within the datetime field there are as the name suggests listed date and times entry i.e. 12/01/11 22:56:56 ect ect.
Problem is i am graphing this and when ms chart reads the duplicate entries as a series. It doesnt like it and comes up with a slightly odd interpretation. I need to get the duplicate entries out to establish a single time series.
I was proposing to clone the original datatable and run a loop to remove the duplicates. I have been trying to do this for days and have played with a whole load of examples, without success. Can anyone point me in the right direction on this.
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Apr 2, 2009
I have a table with many values inside of it that might have single quotes around them. I need to create a duplicate table without those single quotes. I can't modify the original table as I need to use it, 'as-is' later.
I've done this with a table.Clone and using a foreach to loop through the rows and columns removing single quotes as I need and then putting that new row into the new table. It works and it's straight forward.....but
I'd like to do the same thing using LINQ. This was my attempt....
Dim myResults = From myRow In dtTable _
From myItem In myRow.ItemArray _
Where TypeOf myItem Is String AndAlso _
myItem.ToString.StartsWith("'"c) AndAlso _
myItem.ToString.EndsWith("'"c)
As you can see - I didn't get very far. I had trouble finding examples that weren't looking at a specific column in the DataRow. It looks like my code does pull back all the matching results - but I'm at a lose for how I can create a duplicate table/modify the values.
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Dec 8, 2011
I have a datagridview binded to a list of objects... I have a column named Selected containing a checkbox. When these checkboxes are checked and a button is clicked, I want those particular rows to be removed. I initially set it out to iterate through the grid's rows and RemoveAt(SelectedRowIndex) but of course when it removes an object from the List of objects at the selected row (IE Row 1, 4 and 6), the list indexes change and it fails to work properly when it goes to remove the next row since Row 4 is now row 3 in the list...? What is the best way to do this?
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Aug 19, 2011
I'm trying to populate the list of a combobox by binding it to a datatable. Also, I want the selected value of the combobox to be bound to an object property so that when the selected value changes, it's automatically updating the object. However it's causing an error at runtime: "This causes two bindings in the collection to bind to the same property.
Parameter name: binding" I thought binding the dropdown list to a datatable and the selected value to an object were different properties but obviously I'm not getting it right.
Code:
Private Sub PopulateSiteSelect()
With Me.PlanSiteSelect
If _Plan.PlanID <> Nothing And _User.UserID <> Nothing And _Plan.Category <> Nothing Then
[Code]....
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Apr 16, 2009
i'm making a small word processor program using vb 2008 and i need the codes for the following commands: creating table adding and removing rows and columns header and footer
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May 29, 2009
I have a DGV that has a datasource to load the rows I need for display.
Now, I need to save the selected rows to a DataTable.
binding the DGV. I created the DataTable in my DataSet dsProfiles1 and created a BindingSource - bsDataTableDGV
DataTable:
ClientID Int32 not null PK
ClientName String not null
ProgramNo Int32 Not Null
[Code].....
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Feb 15, 2012
I have a form with a textbox and a add button. User can write a name down on the textbox and click add button. it will save in a datatable with auto ID. After that, the textbox is cleared and the user can write another name on the text box and click the button. This should add to the existing datatable on memory with existing ID + 1. Show on the gridview. (this is just for display purpose to confirm it works)
I have a datatable like this.
Button1.click() event
Dim name = txtname.Text
Dim dt As New DataTable
dt.Columns.Add("ID", GetType(Integer))
[Code] .....
At the moment I have sometime like the code above. in the real program, it is not just name and it is not just one datatable so i just mock up some code. And this code for aspx.
<asp:TextBox ID="txtname" runat="server">
</asp:TextBox><asp:Button ID="Button1" runat="server" Text="Button" />
<asp:GridView ID="GridView1" runat="server">
</asp:GridView>
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Jan 14, 2011
I Have a datatable in .net. I need to flip the location of two of them. For example, a datatable that the select statement had an order by priority clause. The user wants to up the priority of a single row by selecting it and clicking increase priority, how do i move a row up (AKA flip two rows)
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Jul 13, 2010
I have this sub :
Private Sub error_out(ByVal line As Integer, ByVal err_col As Integer, ByVal err_msg As String)
Dim ln = t_erori.Rows.Add
[Code]....
I suspect this is because it's trying to add the same row twice.
How can i make this work ? Or what else method could I use to do this ?
I need this datatable because my app is writing some results in there, but any other method to store the results that works with parallel.for would be ok.
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May 13, 2012
I have one datatable tempDT with value :
[Code]...
The problem is I want merge duplicate serial_no into one row which the value of testong adding to new column. I have tried many ways, but I can't find the solution. Here is my code behind :
[Code]...
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Apr 17, 2009
I have a datatable object, which is populated from a webservice.Apparently, the web service just throws everything (data) back to me. The data which gets in my datatable looks like this:
Dept Code Value
Science ABC 5
Science ABC 6
[code].....
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