Adding Values For Datatable Column?
Dec 27, 2010i have a sum column in my datatable and want to add the values?
is compute a good method to use?
Similar Messages:
DataSource Controls :: Move 1 Column Values To Another Column In Datatable?
Mar 31, 2010i have a datatable with several columns and rows. now i want to copy the last column fully (all rows) and create the new column with that values.
it means last column values sholud be moved to new column (now this is the last column).
Adding An Extra Column In A Datatable
Jun 21, 2010How do you add an extra column in a datatable which will be used for another query
View 3 RepliesAdding Duplicate Type Of Column To A Datatable?
Jan 9, 2011How can i add same fields for columns in a datatable. I wan to make a datatable which repeate column name of same type multiple times, but dot net dont allow me to add that, but i want to do that hw can i do that?
table.Columns.Add("S.NO", typeof(int));
table.Columns.Add("DC", typeof(string));
table.Columns.Add("DC", typeof(string));
table.Columns.Add("DC", typeof(string));
table.Columns.Add("ST", typeof(string));
table.Columns.Add("ST", typeof(string));
table.Columns.Add("AD", typeof(string));
table.Columns.Add("AD", typeof(string));
ADO.NET :: Distinct Values From A Column In Datatable?
Sep 21, 2010I have a datatable dt with 4 columns. I want to retrieve only distinct values from column1 of datatable.
How can I achieve this using c# code?
C# - Order Datatable By Relevance Using Linq By Column Values Which Are Comma Sperated?
Aug 31, 2010I have a Datatable that contains a column called Tags, Tags can have values such as
row[0] = Tag1
row[1] = Tag1, Tag2
row[2] = Tag2, Tag3
row[3] = Tag1, Tag2, Tag3
row[4] = Tag4, Tag6
and are seperated by comma's etc..
I have the value of Tags for the current document and have run a query to select all other documents that have either of the Tags in there row. for example lets say the current document Tags are (Tag1, Tag2, Tag3)
so from the example rows above all the rows above are returned apart from row[4] Here is the bit i'm lost with, i now want to sort the datatable by how many tags are matched with the current document. so for the example i've talked about so far they should be ordered
row[3] = Tag1, Tag2, Tag3
row[1] = Tag1, Tag2
row[2] = Tag2, Tag3
row[0] = Tag1
Not used linq before but was told it could do this. so far i have
var query = from c in dt.AsEnumerable()
orderby c.Field<string>("Tags").CompareTo(dr["Tags"]) ascending
select c;
Forms Data Controls :: Set A Column In A DataTable To Be A Primary Key For An Existing Datatable
Apr 2, 2010If I am passed a datatable and I cant change the column structure..is there anyway to set an existing column to a Primary key so I can easily Find() the row I am looking for?
View 1 RepliesADO.NET :: How To Add Column To DataTable Inside Loop Then Sort On New Column
Mar 22, 2011I am grabbing an XML feed an throwing it into a dataset. I am looping through the datatable that is in the dataset and adding a column to the datatable (Distance) that is the result of a calculation. What I then need to do is sort the dataset on the new column (Distance) I added, but it is not working... Here is a sample of my code.
[Code]....
Adding A DataColumn To A DataTable?
Nov 22, 2010How do I go about adding a ButtonColumn to a DataTable.
I am basically using a DataTable as the DataSource of a DataGrid and need to add a ButtonColumn to the DataTable so that when I DataBind it to the DataGrid it all works.
Although when I try
dt.Columns.Add(buttonColumn)
This is not allowed. It has to be a basic DataColumn.
SQL Server :: Update Column Into Identity Column By Removing Null Values?
Aug 10, 2010I have a table converted from Access and the identity keys were lost. Now I need to make the id column the identity column, but it already has a lot of null values, how do I auto generate integer values for the null rows? The row ids are incremented, so if there is a way to auto increment the ids
View 7 RepliesForms Data Controls :: Making Visible Of Gridviwe Column If All Values In Selected In A Column Is Not Null
Dec 30, 2010I have gridviwe having 2 columns:
1) DocNumber 2)Title
query select docnumber,title from tbl_docs.
BindwithGridviwe(sql);
Now the issue is that that every document doesn't has document number. I want to make invisible the docuNumber column of the grid viwe if all values in the docNumber retrieved are null.for example:
docnumber tite
null Document 1
null Document 2
null doucment 3
null document 4
if returned result match above where all docnumber are null then make the gridviwe docnumber column ivisible eslemake the greidviwe column visible.
Web Forms :: Adding Rows To Datatable
Dec 6, 2011I have added a row to a datatable and displayed this datatable by binding it to gridview.. Later if i add another row to the same table, the data table displays only the recently added row.. I need to display the previously added row along with the newly added row.. How to do this?
View 1 RepliesC# - Adding A Way To Preserve A Comma In A CSV To DataTable Function
May 17, 2010I have a function that converts a .csv file to a datatable. One of the columns I am converting is is a field of names that have a comma in them i.e. "Doe, John" when converting the function treats this as 2 seperate fields because of the comma. I need the datatable to hold this as one field Doe, John in the datatable.
Function CSV2DataTable(ByVal filename As String, ByVal sepChar As String) As DataTable
Dim reader As System.IO.StreamReader
Dim table As New DataTable
Dim colAdded As Boolean = False
Try
''# open a reader for the input file, and read line by line
reader = New System.IO.StreamReader(filename)
Do While reader.Peek() >= 0
''# read a line and split it into tokens, divided by the specified
''# separators
Dim tokens As String() = System.Text.RegularExpressions.Regex.Split _
(reader.ReadLine(), sepChar)
''# add the columns if this is the first line
If Not colAdded Then
For Each token As String In tokens
table.Columns.Add(token)
Next
colAdded = True
Else
''# create a new empty row
Dim row As DataRow = table.NewRow()
''# fill the new row with the token extracted from the current
''# line
For i As Integer = 0 To table.Columns.Count - 1
row(i) = tokens(i)
Next
''# add the row to the DataTable
table.Rows.Add(row)
End If
Loop
Return table
Finally
If Not reader Is Nothing Then reader.Close()
End Try
End Function
Getting The Column Header Of A Datatable?
Jun 24, 2010How do I get the column header of a datatable in a gridview which is displayed in a gridview I created. I need to get it so that I can use it as comparison.
View 1 RepliesC# - How To Localize DataTable Column Name
Feb 27, 2010This is my datatable
[Code]....
I want to localize the columns names. Can you tell me how can I do this? I localized my .aspx pages, but I don't know how to localize the text in .cs files.
ADO.NET :: Can Add New Column In Already Filled DataTable In Vb.NET
Mar 3, 2011I have a dataTable filled with data.
And I want to insert new column into same datatable without affecting original data.
Web Forms :: Adding Datarows To Existing Datatable In Dataset?
Feb 5, 2010I need to add rows to an existing (maybe) datatable in a dataset that combines the IIS6 index search with my own sql table. I keep getting object reference errors.
[Code]....
DataSource Controls :: Adding A DateTime Field To A DataTable?
May 20, 2010I'm looping through an ArrayList and creating a column in a DataTable from each field. One of my fields is a DateTime field, and I've noticed that when I create the columns, it's being changed to a String, but I need it to still be a DateTime field for sorting. I'm trying to do this, but it's not quite working.
[Code]....
Forms Data Controls :: Adding Dt.select To New Datatable?
Apr 14, 2010i am using dt.select to filter rows
now i want to add those filter rows to a datatable
Web Forms :: Adding Rows To Datatable And Binding It In GridView
Dec 9, 2011I have a gridview with empty data template. In this empty data template i have a table(HTML) with 4 columns. When user enters data i want to save this in a datatable temporarily at a button click event.. Again if user wants to add one more rows data that also should be added to the same table where i added previous row data. So now the datatable has 2 rows. Like this he may add any no of rows. What i want is all the rows should be displayed when i bind datatable to gridview..At the click event i am adding 1 row at a time to the datatable
View 1 RepliesDataSource Controls :: Adding Rows And Updating Tables From Datatable
Mar 7, 2010Maybe this could be a simple questino, but for me it's difficult to do this action: I have a table in sql server 2005 with some records stored, for example 10 records. The primary key of this table, let's call it "Employee", it's a number field with an autoincrement constraint. I want to store more data into the table by using a OdbcDataTable object and OdbcDataAdapter and adding new rows to the datatable and afeter that use the "Update" method from the OdbcDataAdapter object.
The big deal is this: let's suppose that I want a add a new record to the datatable object, using any method or code sequence that you want. if I have 10 records stored on the data base table, when I retrieve this table schema by using the OdbcDataAdapter "Fill" method, I have a copy of the data base table schema in the DataTable object, right?. if I add a new row on the datatable object, it's suppose that the primary key column of that table must AUTO-INCREMENT the value of the key, I mean if the last value that I store on the table was the number 10 on the PK field, when I add a new row on the datatable object, the PK value on the datatable object must be the number 11 if the autoincrement constraint is present into the DataTable object, but in my case, it doesn't work
So, How can I define the conditions or set the c# data objects properties to wor in that way???. In this moment the PK column on the odbcDataTable doesn't auto-increment its value when I add a new row on it.
Please helpe with this.
PD: I have another question about the DataTable object, how many records can store this object?? I have some problems with this because sometimes when I use the Fill() method to get data into the DataTable or a DataSet object there's no problem if the Fill() method retrieves about 142000 records, but when I retrieve over the 145000 records, when I inspect the DataSet or DataTable object by using the debuging mode, they have null value. Any of you can tell me why this situation ocurrs??
DataSource Controls :: Adding List Item Collection To Datatable?
Jul 7, 2010I have a list item collection. How to add this list item collection to a datatable.
The list item collection has the following fields:
Student Name, Maths Mark
John 20
Mac 30
John 35
I want to create a html table from the data table, which is grouped on the Student Name field.
DataSource Controls :: Limiting String Length When Adding New DataTable Row?
Mar 13, 2011I need to limit the length of the string that load into a DataTable that is being used to display. The data I am loading is coming from another DataTable. How do I shorten row["CG_GalleryName"] contents to 24 characters.
Convert.ToString(row["CG_GalleryName"]) -- how do I set this length to 24 characters? Using it in the below code.
if (Convert.ToInt16(row["rnum"]) == 1)
{
dr = GLinks.NewRow();
dr["rnum"] = row["rnum"];
dr["L_URL"] = row["L_URL"];
dr["CG_GalleryName"] = row["CG_GalleryName"];
dr["L_Picture"] = row["L_Picture"];
GLinks.Rows.Add(dr);
How To Sort The Data In Column Of Datatable
Feb 26, 2010how can i sort the data in col of datatable or other way to sort
View 7 RepliesChange Column In DataTable Dynamic?
Dec 24, 2010i have list box, in that list box have some fields(SQL Table fields) in run time i arrange the fields(based on my requirement order) , based on the list i want to change the columns in data table dynamicaly. how i change the columns in the datatable.
View 6 Replies
