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?
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table.Columns.Add("DC", typeof(string));
table.Columns.Add("DC", typeof(string));
table.Columns.Add("DC", typeof(string));
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Aug 31, 2010I have a Datatable that contains a column called Tags, Tags can have values such as
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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()
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select c;
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[Code]....
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docnumber tite
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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
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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.
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DataSource Controls :: Adding A DateTime Field To A DataTable?
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[Code]....
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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
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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