How 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.
How can I add an array of string to data column of a an empty data table in asp.net?
View 1 RepliesHow do you add an extra column in a datatable which will be used for another query
View 3 Repliesi have a sum column in my datatable and want to add the values?
is compute a good method to use?
I 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 RepliesI 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
How 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));
I 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]....
I'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.
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i am using dt.select to filter rows
now i want to add those filter rows to a datatable
I 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 RepliesMaybe 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??
I 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.
I 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);
I have a DataTable that I am creating and binding to a GridView. Currently the headers do not have any spaces and it makes it hard to read. I want to space them out but I'm having a minor issue. What I am trying to accomplish :
Dim dc As Data.DataColumn
dc = New Data.DataColumn("Updated Date", System.Type.GetType("System.String"))
dt.Columns.Add(dc)
What I currently have :
Dim dc As Data.DataColumn
dc = New Data.DataColumn("UpdatedDate", System.Type.GetType("System.String"))
dt.Columns.Add(dc)
I know that I can set the HeaderText in the columns declaration like below, but I won't know how any columns I am going to have. And would rather the columns be generated automatically.
<Columns>
<asp:BoundField DataField="UpdatedDate" HeaderText="Updated Date" />
</Columns>
I'm using a DataGrid with edit functionalities in my project. It's handy, compared to having to edit its source data manually, but sadly, that means that I'll have to deal with validating user input a bit more.
And my problem is basically just that. When I set my DataGrid to EDIT mode, modify the values and then set it to UPDATE, what is the best way to check if a value that I've entered is, in fact, compatible with the corresponding column's data type?
i.e. (simple example)
// assuming
DataTable dt = new DataTable();
dt.Columns.Add("aa",typeof(System.Int32));
DataGrid dg = new DataGrid();
[Code]....
I need to create an interface for adding users to .Net Membership DB through an existing database. My Idea is to read each row from database from existing users table in a datatable and then iterate through each row and add it to new database. I cannot directly copy the rows from existing users table because the password stored in .Net Membership provider is in ir-reversible hash code and hashing is done through encryption algorithm present in front end code. My User count is huge (in millions).So what should i use to read the records, Dataset or datatable. Also tell what is the max number of rows it can hold.
View 3 RepliesIn may page, i am assigning DataTable to a GridView as follows:
GridView1.DataSource = GetDataTable();
GridView1.DataBind();
Now,the definition of GetDataTable is as follows:
DataTable abcd = new DataTable();
DataRow dr;
abcd.Columns.Add(new DataColumn("Column1"));
abcd.Columns.Add(new DataCoumn("Column2"));
dr=abcd.NewRow();
dr["Column1"]="My Name";
dr["Column2"]="<p>My Address Line1</p><p>My Address Line2</p>";
abcd.AddRow(dr);
return(abcd);
dont bother about code syntax or functions, I just dont have actual code right now.Its on the similar lines...
My question is, when i see GridView, It prints <p></p> in Column2 as it is.. it doesnt consider those tags as HTML tags...
I want DataColumn to consider those tags as HTML, so that my address gets printed on two different lines but in same column.
If you guys have any other way to work around... just the thing is that I must assign DataTable to GridView.
I'm trying to set the datatype of my DataColumn like this:
[Code]....
But I get an error that says Name cannot begin with '>' character.
I combined three columns into 1 column to customize the DataTextField of my asp:RadioButtonList.
I'd like to format Date (MM/dd/yyyy) and Time (h:mm tt).
This is the code:
[Code]....
I wanna iterate the "DataColumn" values, I have retrieve data column from a dataSet.
GridView1.DataSource = ds.Tables[0];
DataColumn colt = ds.Tables[0].Columns["dorc"];
the dorc field is a boolean value, I want to replace the boolean value from:
true-->debit
false-->Credit
But I can't access the Columns["dorc"] values..
i am trying to create a datatable entering the columns that i create before, but i have a problem, the dataColumn doesn't have the required data, there is a AllowDbNull but it doesn't work.
Then i would like to add other restrctions like MinLegth.
Does anybody know how to do this?
'DataTable' is an ambiguous reference between 'System.Data.DataTable' and 'Microsoft.Office.Interop.Word.DataTable'
View 3 RepliesI am trying to generate all days of between two dates, into a datatable (from 2 Textbox's querry).
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I was reading: [URL]
But I have give a compilation error:
CS0246: The type or namespace name 'DataTable' could not be found (are you missing a using directive or an assembly reference?