C# Discussion Boards - CodeProject

Re: Suggetion needed about StreamWriter Class [modified]

25-Jan-07 22:27

i'm using DataTable to hold the retrieved records.

bobsugar22225-Jan-07 22:56

Re: Suggetion needed about StreamWriter Class

25-Jan-07 22:56

From a DataTable object you can simply call the WriteXml(string filename) method to write to an XML file.

To write with a StreamWriter try:

using (StreamWriter sw = new StreamWriter(filename))
{
    try
    {
        foreach (DataRow row in myDataTable)
        {
            sw.WriteLine(row["columnName1"]);
            sw.WriteLine(row["columnName2"]);
            // etc...
            // obviously you'll have to encapsulate
            // your data with html tags manually eg:
            sw.WriteLine("<body>");
            sw.WriteLine("<otherformatting>" + row["columnName1"]);
            sw.WriteLine("</body>")
            // which is why we 
            // suggested XmlWriter or XML+CSS
        }

    }
    catch (Exception er)
    {
        //handle exception
    }
    finally
    {
        sw.Close();
    }
}

-- modified at 5:02 Friday 26th January, 2007

Saira Tanwir25-Jan-07 23:00

Re: Count of Listbox values

25-Jan-07 23:00

thanks for the suggestion.
i'll try it and if it still doesn't work for me i'll post another query for u to answer Laugh | :laugh:

Count of Listbox values

fahiemulleh25-Jan-07 19:50

fahiemulleh

25-Jan-07 19:50

Hi all. In Gridview, we can check whether grid contains rows or not by

Gridview1.Rows.Count .. Please tell me how to check against listbox.. Basically, I want to check whether listbox contains values or not. if it contains no value, then a message is displayed like NO RECORD FOUND. please help me in this regard.

Martin#25-Jan-07 19:59

Martin#

25-Jan-07 19:59

Hello,

The ListBox class has a Property Items, which contains all the infos you need!

listBox1.Items.Contains(object); //search for an item
listBox1.Items.Count; //number of items

All the best,

Martin

the marked read only fields show above the Data Grid , can anyone teach me how to correct this , thanks very much !

cchmark25-Jan-07 18:46

cchmark

25-Jan-07 18:46

I've written a program to access Text File , and filtered to a Data Table, then to Data View and Data Grid , and use GridStyle to display read only fields , but when I add a comments field in the GridStyle as a edited column , anytime I click the Data Grid field then push button to refresh , the marked read only fields show above the Data Grid , can anyone teach me how to correct this , thanks very much !

Argument issues

Saira Tanwir25-Jan-07 17:36

25-Jan-07 17:36

Oh Brainy Ones!

final_list=Convert.ToString(attribute_list.LastIndexOf(",",1,attribute_list.Length));<br />

All it returns is -1. If I change the value of the third argument of the function to 1,it returns -1.
The above code gives an exception

Argument Out of Range exception. Count must be positive and count must refer to a location within the string/array/collection.

i.e. count is the third argument

Christian Graus25-Jan-07 18:10

Christian Graus

25-Jan-07 18:10

Well, it's hard to comment without knowing what is in attribute_list. It seems it doesn't contain a ,, and so the index is -1 ( indicating failure ).

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Saira Tanwir25-Jan-07 18:27

25-Jan-07 18:27

i've checked the string and it does contain a ",", but the third argument of the LastIndexOf() still gives the exception.

Count must be positive and count must refer to a location within the string/array/collection.

the only time it doesn't give the exception is when v give 1 in its third argument.

any other suggestions??

Christian Graus25-Jan-07 18:31

Christian Graus

25-Jan-07 18:31

First suggestion : use ToString instead of Convert.ToString
Second suggestion: change the 1 to 0, strings are 0 based. This means when you start with 1, the Length property is 1 bigger than what is allowable, hence the exception.
Third suggestion: if you want to search the entire string, don't specify a start and length at all, you can just give it the ',', and it will search the entire string.

Christian Graus - C++ MVP

'Why don't we jump on a fad that hasn't already been widely discredited ?' - Dilbert

Saira Tanwir25-Jan-07 18:35

25-Jan-07 18:35

ThankYou

it worked Big Grin | :-D

Karthik Kalyanasundaram25-Jan-07 18:36

Karthik Kalyanasundaram

25-Jan-07 18:36

You need to use,

int index = attribute_List.LastIndexOf(",",attribute_List.Length - 1,attribute_List.Length);

Reason: LastIndexOf() method searches for the given string from right to left, so you need to specify the second parameter, ie. the startIndex from right to left. Hope the thing is clear.

bobsugar22225-Jan-07 21:42

MS ReportViewer Cause Application Error

25-Jan-07 21:42

At first I though WTF?! Then I tried it...

That is just weird. The documentation doesn't say it's right to left...

kakarato25-Jan-07 16:12

kakarato

25-Jan-07 16:12

I'm using VS2005 with MSAcsess and MS ReportViewer to genearate a report. It work perfectly in my development environment. When i try to deploy the application to Virtual PC with a clean environment, it work fine. The application will hang when user open the report form and close and reopen (sometime happen on the third time)again the report form.

Below is the code. And also i found out if user close the form in PrintLayout Mode. I must cancel the report rendering in form close event. this.reportViewer1.CancelRendering(5000); Else the program will hanged forever when user click PrintLayout button.

<br />
            FormReport frm = new FormReport();<br />
            this.Cursor = Cursors.WaitCursor;<br />
            try<br />
            {<br />
                frm.ShowReport(sqlStatement + frm2.QueryString + " " + order , reportName);<br />
                frm.ShowDialog();<br />
            }<br />
            catch (Exception ex)<br />
            {<br />
                MessageBox.Show(ex.Message);  <br />
            }<br />
            finally<br />
            {<br />
                //frm.Dispose();<br />
                this.Cursor = Cursors.Default;<br />
            }<br />
<br />
        private void ShowReport(string reportName, ReportsDS reportDS)<br />
        {<br />
            if (reportDS.Report.Rows.Count < 1)<br />
            {<br />
                MessageBox.Show("No records found. Please import data into system.");<br />
                this.Close();<br />
            }<br />
            ReportDataSource reportDataSource = new ReportDataSource();<br />
            reportDataSource.Name = "ReportsDS_Report";<br />
            reportDataSource.Value = reportDS.Report;<br />
            this.reportViewer1.LocalReport.ReportEmbeddedResource = reportName;<br />
            this.reportViewer1.LocalReport.DataSources.Add(reportDataSource);<br />
            this.reportViewer1.RefreshReport();<br />
        }<br />
<br />
        private void FormReport_FormClosing(object sender, FormClosingEventArgs e)<br />
        {<br />
            try<br />
            {<br />
                this.reportViewer1.CancelRendering(5000);<br />
            }<br />
            catch (Exception ex)<br />
            {<br />
                MessageBox.Show(ex.Message); <br />
            }<br />
        }<br />
<br />
<br />

Rich Text Box to Rich Text Box - Help!

rvp717y25-Jan-07 12:57

rvp717y

25-Jan-07 12:57

Hi there,
I'm creating an application to securely record information typed in by the user.

A main window (let's call it 'A') with a large RTF box displays the text so far - this text box is read-only to preserve the integrity of previous entries, so no editing is allowed here.

When the user wants to post a new entry the they click a button and a new RTF box appears (call this one 'B') - into this the user can type or paste RTF compliant entries, when done, clicks "OK" and the contents of this RTF box (B) need to be added to the read-only main window (A).

I don't have a problem with the protection and getting stuff from B into A - however I have a major problem maintaining the RTF formatting when taking the contents of one RTF control and appending it to the contents of the other read-only version!

I don't want to save RTF from B to file and read that in to A as this will present the opportunity to subvert the process and add additional material. Likewise, I can make this work very reliably if I stick with plain text - but the moment I want to retain the RTF formatting it all gets very hard.

Any thoughts?

Kind regards,
John.

Luc Pattyn25-Jan-07 14:25

Luc Pattyn

25-Jan-07 14:25

I suggest when you add some RTF text, you also add whatever commands are required
to return all text attributes to their neutral settings (i.e.
default font, not bold, not italic, black, etc) plus a new line;
as a result each consecutive piece of RTF will start from the same known situation.

Smile | :)

Luc Pattyn

rvp717y26-Jan-07 9:10

rvp717y

26-Jan-07 9:10

Luc,
That's kind of what I'm doing now, but I'd like to allow the users to use the full RTF formatting options open to them, including pasting in graphics.

Kind regards,
John.

bobsugar22225-Jan-07 23:15

25-Jan-07 23:15

I assume you have been trying to do something like:

rtfReadOnly.Rtf += rtfEdit.Rtf;

The problem is that you will be binding two complete rtf documents together. Which will end up with invalid rtf. You should read up on the rtf format as I think you will have you modify the raw rtf strings of both rtfs before binding them together.

By this I mean removing the rtf header from the rtf doc you are trying to add and the trailing '}' from the readonly rtf.

bobsugar22225-Jan-07 23:31

25-Jan-07 23:31

I managed to get it to work. Try this:

string rtf1 = rtfReadOnly.Rtf.TrimEnd("}\r\n".ToCharArray());
string rtf2 = rtfEdit.Rtf.TrimStart(@"{\\rtf1".ToCharArray());
rtfReadOnly.Rtf = rtf1 + rtf2;