I'm having a Null Reference Exception problem when performing simple calculation using C# and WPF.  My main form has a button that brings up an on screen keypad where a number is entered and then returns the number to the respective text boxes, grossLbsTextBox and tareLbsTextBox.  This code worked fine when I used Winforms, but will not work as WPF.  I'm new to C# so I'm sure it's something simple.  Here is the code.  I indicated the line where the exception is thrown.  Thank you!

 public string strLbsEntered;
        private void btnGrossLbs_Click(object sender, RoutedEventArgs e)
        {
            using (NumberPad formObject = new NumberPad())
            {
                formObject.ShowDialog();
                string strLbsEntered = formObject.StrLbsEntered;
                grossLbsTextBox.Text = strLbsEntered;
            }
        }
        public string strTareLbs;
        private void btnTareLbs_Click(object sender, RoutedEventArgs e)
        {
            using (NumberPad formObject = new NumberPad())
            {
                formObject.ShowDialog();
                string strLbsEntered = formObject.StrLbsEntered;
                tareLbsTextBox.Text = strLbsEntered;
            }
        }
        
        private void grossLbsTextBox_TextChanged(object sender, TextChangedEventArgs e)
        {
            grossLbsTextBox.TextChanged += onChanged;
            //EXCEPTION THROWN HERE>>> tareLbsTextBox.TextChanged += onChanged;
            

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i have a very simple project to show all of the rental cars in one single company location. But the issue is I want to show all of the rental cars like 50 vehicles on the map.
However, the location is the same. How can I show them on the map? If I just use same location, the car icon will basically overlap each other.
i use c#, mvc, and razor.

https://developers.google.com/places/web-service/search

I want to use above API to get place = 'rv_park' and my question is if I want to get place type = 'rv_park' in california only.
how can i do that? Basically, I just do not know how to filter by state. I use mvc/c#/razor.

Thank you for your helps in advance.

I am trying to extract text from a PDF using iTextsharp library. I've implemented the IRenderListener listener and call PdfReaderContentParse.ProcessContent() to parse:

reader = new PdfReader( in_file );
XMLRenderListener listener = new XMLRenderListener();
PdfReaderContentParser parser = new PdfReaderContentParser( reader );
parser.ProcessContent( page_num, listener );

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When the listener's RenderText( TextRenderInfo renderInfo ) method is called, usually the renderInfo.string contains correct text, but not always. For an example, a PDF contains the following symbols:When the method is called, the structure contains the following:
It is not clear from the picture above, but the PdfString.value actually contains two characters:
I tried to copy the character from Adobe Reader to the clipboard, and analyzed by Clipboard Viewer.
The "Text" part shows the same bytes:, but the Unicode Text Format part shows the correct Unicode value of the character, which is 2266
Also, if I paste that clipboard content to a text editor, I can see the correct character with the code 2266.

The question now: is it possible to make iTextsharp also convert the symbol to correct Unicode value and how to achieve that?

I have this code which I’m using with the attached file and was wondering why the last line (immediately below) is returning a casting error
List<LafAmend> Result = Codes.Where(i => i.Name.Substring(0, 1) == "H");

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace ConsoleApp1
{
    public delegate bool CodeCaller(LafAmend lafamend);

    class Program

    {
        static List<LafAmend> Codes = new List<LafAmend>();

        //static bool MyTest(LafAmend lafAmend)
        //{
        //    int test;
        //    return (lafAmend.Name.Substring(0, 1) == "H" && (int.TryParse(lafAmend.INDG, out test)));

        //}
        static List<LafAmend> Where(List<LafAmend> splodge, CodeCaller del)//variable name not important
        {
            List<LafAmend> output = new List<LafAmend>();
            foreach (LafAmend l in Codes)
            {
                if (del.Invoke(l))
                {
                    output.Add(l);
                }
            }
            return output;
        }
        static void Main(string[] args)
        {
            

            string line2 = "";

            foreach (var line in File.ReadAllLines("/Documents/Courses/CSharpQA/Labs/09  DelegatesAndLambdas/Test/Test.csv"))
            {
                line2 = line.Replace(@"""", "");
                string[] Row = line2.Split(',');
                Codes.Add(new LafAmend
               

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I need to sort a foreach statement in an MVC website. I've included the code below. I would like to order the results by item.InteractionDate. I believe it is sorting by the Id rather than the InteractionDate. If you need a snippet from the model, I can add that as well.

<table class="table">
        <tr>
            <th>
                Meeting Date
            </th>
            <th>
                Customer
            </th>
            <th>
                Employee
            </th>
            <th>
                Notes
            </th>
            <th>
                Update Meeting
            </th>
        </tr>

        @foreach (var item in Model.Meetings)
        {
            <tr>
                <td>
                    @Html.DisplayFor(modelItem => item.InteractionDate)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Customer1.Name)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Employee1.FullName)
                </td>
                <td>
                    @Html.DisplayFor(modelItem => item.Notes)
                </td>
                <td>
                    @Html.ActionLink("Edit Meeting", "Edit", "Meetings", new { id = Model.Id}, null)
                </td>
            </tr>
        }
    </table>

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Heads-up: Though its little tricky to explain my scenario i will still try my best to explain as clearly as possible.

I have 4 RadGrids(with Column Picker for each RadGrid) on same page & switching between Radgrids doesnt load the current RadGrid name when looking in view source. Though the Data is loaded for different RadGrids.
Issue is with Column Picker.

Requirement: On Change of a RadComboBox List value a different RadGrid has to loaded. Each RadGrid has a COlumn Picker too.
Column Picker -> (list of columns in RadGrid is bided on serverside to a RadListBox and shown in a RadWindow invoked using Javascript )

Basically i have 4 RadGrids(RadGrid1 through RadGrid4) each of which has CommandIteamTemplate -> & asp:LinkButton OnClientClick opens a RadWindow with list of RadGRid Columns whose Display value is True.
Also these 4 RadGrids are 4 seperate user controls with their own unique Javascript methods and Radwindows.

But When ever i chaneg my RAdCombobox value though a different RadGrid is loaded ... Column Picker still shows from the previous RadGrid. At this moment when i look at the view source it still shows previous RadGrid name with java script methods from the same previous RadGrid.

Example: On my Main Page,
Step 1: on page load, RadGrid1 from first user control is loaded with Column picker1 - which was loaded using Javascript1.
sample code in CommandTemplateItem.. <asp:LinkButton ID="lbtnCP" runat="server" …

Hi, I.'m trying to set up the zoom of an image ,inside a canvas,  to the value of the ribbon menu item selected.
How can I achieve this?

                 ...
                    <RibbonMenuButton Label="Zoom">
                        <RibbonMenuItem Header="25%"/>
                        <RibbonMenuItem Header="50%"/>
                        <RibbonMenuItem Header="75%"/>
                        <RibbonMenuItem Header="100%"/>
                    </RibbonMenuButton>

...

               <ScrollViewer x:Name="scr_Img" Grid.Column="2">
                    <Canvas x:Name="cnv"  Grid.Column="2" Background="Gray">
                        <Grid Width="{Binding ActualWidth, ElementName=cnv_marking}" Height="{Binding ActualHeight, ElementName=cnv}">
                            <Image x:Name="img_Zoom" 
                                SizeChanged="img_Zoom_SizeChanged"
                                MouseDown="img_Zoom_MouseDown" MouseLeftButtonDown="img_Zoom_MouseLeftButtonDown"
                                Height="{Binding ActualHeight, ElementName=cnv}"/>
                        </Grid>
                    </Canvas>
                  </ScrollViewer>

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I am writing an app that will get a list of directories and files.  I am populating a List<string> to store this information.

I created an ENUM to determine what directories and file extensions should be excluded.  I was trying to figure out how to write linq to "removeall" from the list against the values in the ENUM.  

Want to see if there is a way without looping through each value in List<string>.

public static class Enumerators
{
	public enum ExcludedDirectories
	{
		ABC
	}

	public enum ExcludedFiles
	{
		docx,
		Thumbs
	}
}

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My solution is below.

    public static class EnumValidation
    {
        public static List<string> DeleteValues<T>(List<string> value)
        {
            var deletionvalues = Enum.GetValues(typeof(T));

            foreach (var del in deletionvalues)
            {
                value.RemoveAll(x => x.Contains(del.ToString()));
            }

            return value;
        }
    }

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Is there a more efficient way?

Hi,

i am using Windows application.

my client want to set password in MS Access DB.

When end user selecting the file from browse button, system should check the password and set password somewhere in the application.

if the set password and Access password is match then system allow further process.

How to do this in Windows C# applications.?

Hi guys,

I am curious about the benefits of using SDKs. Personally, I prefer avoiding third-party libraries, especially if I don’t see any benefits of having serialized JSON output in class models (I have found this to be the case when using JavaScript, NodeJS, PHP, Python, and other functional programming languages). When using serialized JSON models in Java, C++, C#, and ActionScript, I observed a decline in performance.

However, I am aware that companies including Google, Amazon, Salesforce, etc are generating REST API services for SDK code for developers to consume.
 
What have you found to be the main pros/cons of using SDK, and what are your personal preferences regarding which REST SDK is best for various languages?

Best,
David