I am using Compute for summing up a datatable which has a condition. Sometimes, there are no rows inside the datatable matching my criteria so I get an exception on ComputeObject cannot be cast from DBNull to other types.Is there a way to check/filter the datatable to see if it has the desired rows, if yes only then I apply Compute.
total = Convert.ToDecimal(CompTab.Compute("SUM(Share)", "IsRep=0"));
DataSet ds = new DataSet();
string qry = "select Name,Section,present from presentdays where id='" + TextBox1.Text;
qry += "'";
ds=mvl.GETDS(qry);
foreach (DataRow dr in ds.Tables[0].Rows)
{
TextBox2.Text = dr["present"].ToString();
TextBox12.Text=dr["Name"].ToString();
TextBox13.Text=dr["Section"].ToString();
}
there is no data in id='1'i need to throw the error as there is nothing is found in id='1'
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View 2 RepliesI have one problem with my shopping cart that I really can't figure out all by myself.I want, if a item already exist in the datatable, the quantity to be updated for that item with the new number instead of creating the same item again.I have done a foreach loop because I think that is where I should start.Notes: MyRow[3] is the column holding the quantity.Code:
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//Bengt
I have one big DataTable with X rows. I want to select Y rows from it and bind them to a new ViewList. While doing it, I want to delete these rows from the DataTable (Having X - Y rows).
What is the best and fast way to do it?
I don't know if it is better to create a new DataTable to have the Y and after that bind them to a ViewList or something else?
I'm also looking for example in code how to select/delete rows from DataTable.
I have a DataTable of available time slots. I have another DataTable of reserved time slots. I need to remove from the list of available slots the ones that have been reserved. The blocks are in 15 minute increments, but one of my problems is that the reservation can be longer than 15 minutes. I've had some luck removing one or two, but not all of the required columns.
Here's my code (it doesn't work right now).
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I have been handling everything in code which is not working consistently same in all scenarios.
View 1 RepliesI have a datatable which has an amount column & a status column.I want to sum only those rows who have status '1'. How to do this ?I am summing the column via datatable Compute method.
View 1 RepliesI'm trying to update fields in a DataTable. The field I'm trying to edit is a date, I need to format it.
foreach (DataRow row in dt.Rows)
{
string originalRow = row["Departure Date"].ToString(); //displays "01/01/2010 12:00:00 AM"
row["Departure Date"] = DateTime.Parse(row["Departure Date"].ToString()).ToString("MM/dd/yyyy");
string newRow = row["Departure Date"].ToString(); //also displays "01/01/2010 12:00:00 AM"
}
How come this isn't getting updated?
i have two datatable, while adding rows in second datatable, i want to first check whether the id in the second datatable matches as in the first datatable, if not only then it should be added in the second datatable, else it should display a message...
i dont have any Primary Key defined on any column, so the rows could be repeatative.
Im using "string user = Database.GetMostRecentReply(id).Rows[0][2].ToString();" to get the username from the most recent reply in my forum.
But how do I check if the row is empty? Im using a try catch at the moment, but there must be a better way to do this.
I have a datatable with the ordering of its DataClassIndex column before editting:
DataclassIndex 0 1 2 3 4
When I start modifying some other cells in this datatable, the ordering of DataClassIndex column changes to something like this
DataclassIndex 3 4 2 1 0
How can I modify a datatable content without altering the original order of the datatable.
i want to make a datagrid with 2 columns and many rows the columns i want to have databinding with a datatable
i want the 1 row 1 column of datagrid have data from 1 row of datatable
i want the 1 row 2 column of datagrid have data from 2 row of datatable
i want the 2 row 1 column of datagrid have data from 3 row of datatable
i want the 2 row 2 column of datagrid have data from 4 row of datatable
......
......
i use something like this
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but i have two times the same in tha datagrid left and right
How to select top n rows from a datatable/dataview in asp.net.currently I am using the following code by passing the table and number of rows to get the records but is there a better way.
public DataTable SelectTopDataRow(DataTable dt, int count)
{
DataTable dtn = dt.Clone();
for (int i = 0; i < count; i++)
{
dtn.ImportRow(dt.Rows[i]);
}
return dtn;
}
Exporting DataTable data to CSV file. It is working fine as expected as long as the export records are less than 65,536. When the records are more than 65,536 , only 65,536 records are shown in CSV file (remaing records are not shown). When the export is done(with more than 65,536 records), opening the file shows below message window. File is not loaded completely. When the Ok button is selected, below text displayed...
This message can appear if: You are trying to open a file that contains more than 65,536 rows or 256 columns. To fix this problem, open the source file in a text editor such as Microsoft Word. Save the source file as several smaller files that conform to this row and column limit, and then open the smaller files in Excel. If the source data cannot be opened in a text editor, try importing the data into Microsoft Access, and then exporting subsets of the data from Access to Excel. You are trying to paste tab-delimited data into an area that is too small. To fix this problem, select an area in the worksheet large enough to accommodate every delimited item.
Notes: You can not configure Excel to exceed the limit of 65,536 rows and 256 columns. By default, Excel places three worksheets in a workbook file. Each worksheet can contain 65,536 rows and 256 columns of data, and workbooks can contain more than three worksheets if your computer has enough memory to support the additional data. Solution:- Seems like here is the suggested solution. But it takes ages to export and show data. An export is done about 15mins ago, still it is doing that. Has anyone managed to find/resolve this issue?
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In my simple starter asp page I create a DataTable and populate it with two rows. The web site allows users to add new rows. My problem is the DataTable doesn't save the information. I've stepped through the code and the row gets added but the next time a row is added it's not there, only the original two and the newest one to get entered.
I have gotten around this, in an inelegant way, but am really curious why the new rows are being saved.
My code:
protected void Page_Load(object sender, EventArgs e)
{
_Default.NameList = new DataTable();
DataColumn col = new DataColumn("FirstName", typeof(string));
_Default.NameList.Columns.Add(col);
col = new DataColumn("LastName", typeof(string));
_Default.NameList.Columns.Add(col);
DataRow row = _Default.NameList.NewRow();
row["FirstName"] = "Jane";
row["LastName"] = "Smith";
_Default.NameList.Rows.Add(row);
row = _Default.NameList.NewRow();
row["FirstName"] = "John";
row["LastName"] = "Doe";
_Default.NameList.Rows.Add(row);
}
protected void AddButton_Click(object sender, EventArgs e)
{
DataRow row = _Default.NameList.NewRow();
row["FirstName"] = this.TextBox1.Text;
row["LastName"] = this.TextBox2.Text;
_Default.NameList.Rows.Add(row);
_Default.NameList.AcceptChanges(); // I've tried with and without this.
}
I've tried saving them to GridView control but that seems like quite a bit of work. I'm new to ASP.Net but have done windows programming in C# for the last two years.
I have as script that runs a stored procedure to fetch a comment along with it's id. There are multiple comments and I want to display them but I am having problem with display all the records. Here is my code:
Using con
Using sda As New SqlDataAdapter()
Try
cmd.Connection = con
Catch ex As Exception
Response.Write("Error" & ex.Message)
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How do I make it so that the returned results will be like this:
6 First Comment
7 Second Comment
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 want to copy rows from one datatable to another.
View 1 Replieshow can i check distinct val in col_1 of datatable and assign seq no to each distinct val of col_1 to col_2?
View 6 Repliesif (dt.Rows[i]["Code"] == code)
{
Label lblLang = (Label)(((e.Item as GridItem).FindControl("lblLang") as Label));
lblLang.Visible = true;
}
else
{
}
}
I am adding a new language Fr-FR in the code above. fr-FR already exists in my DB's Language Table. I do not want to add duplicate values in my table. There should be only one fr-FR.
I have a DataTable for which a PrimaryKey constraint has been set to be a combination of an integer column and a datetime column. When I try to 'Find' a row by saying,
dtFunds.Rows.Find(iContainerIndex)
I get a null value. iContainerIndex has been defined as an object array of size 2 with the integer ID and date values in it.
When I set a breakpoint in my code, I see that the very same values are present in the datatable.
If I try to execute, DataTable.Select() method with the integer column filter, I get a result - but returns no result when called with the date column filter.
What am I doing wrong here? The very same DateTime value is present in the datatable.
This is datat table format :
TagName Timestamp Value
Tag1 21-2-2011 12
Tag1 22-2-2011 1
Tag2 21-2-2011 13
I want in this Format
TimeStamp Tag1 Tag2
21-2-2011 12 13
22-2-2011 1 0
iam working with gridview in asp.net3.5,Sqlserver2008 I am retrieving data from a SP into a datatable.i need to store this table into gridview. but am getting the last row from my datatable into my gridview.
here i need to add each row to the datatable.
my grid is like this:
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I am trying to use a SqlDataAdapter to fill a DataTable, which I use as a data source to a DataGrid. The query is fine, at least when I run it manually in SSMSE. When I do the fill operation, the table gets the right columns, but no rows. The most frustrating part of this is that the code is identical (with a different query) on a different page. I cannot post the query, but my initialization code looks like this:
SqlCommand areaDAC = new SqlCommand (areaQuery, connection);
areaDAC.Parameters.Add (new SqlParameter ("@param", System.Data.SqlDbType.NVarChar, 50));
m_areaDataAdapter = new SqlDataAdapter (areaDAC);
Then to use it:
m_areaDataAdapter.SelectCommand.Parameters["@param"].Value = "Filter Val";
DataTable table = new DataTable ();
m_areaDataAdapter.Fill (table);
At this point, table has the right number of columns and no rows. I know the parameters are being added correctly, I know that data exists for the given query.
Update (as provided by Nik in a comment):
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