What is difference between DTO and POCO classes in VS

POCO- Plain Old CLR (or) Class Object

public class Employee
{
    public int Id {get;set;}
    public string FirstName{get;set;}
    public void Salary()
    { 
        Console.WriteLine("10000");
    }
}
DTO -no behaviour - Data Transfer Object

public class EmployeeDTO
{
    public int Id {get;set;}
    public string FirstName {get;set;}
}

Issue: Visual Studio Displaying integer values in hexadecimal

Solution: Debugging time Go To quick watch in a visual studio And right-click quick watch and unselect hexadecimal

Nuget package Generation for customized DLL

first download "nuget.exe"

open cmd and change the path to  particular folder in which "nuget.exe" is downloaded.

generate nuspec file using folling command - nuget spec "E:\Naresh\proj.csproj"

package -  it will generate this type of file like proj.csproj.nuspec

edit that file to make necessary changes like below


<?xml version="1.0"?>
<package >
  <metadata>
    <id>proj</id> // project name
    <version>1.0.0</version>
    <authors>Naresh</authors>
    <owners>Naresh</owners>
    <requireLicenseAcceptance>false</requireLicenseAcceptance>
    <description>Package description</description>
    <releaseNotes>Summary of changes made in this release of the package.</releaseNotes>
    <copyright>Copyright 2019</copyright>
    <tags>Tag1 Tag2</tags> // no need
    <dependencies>
      <dependency id="SampleDependency" version="1.0" /> //no need of samples
    </dependencies>
  </metadata>
  <files>
    <file src="E:\Naresh\proj\bin\Debug\*.*" target="lib\net461" /> // main project file to package - means debug location
  </files>
</package>


we need build the package based on that nuspec file- example cmd path E:\download> nuget pack proj.csproj.nuspec

done...

application goto project manage nuget packages - settings - add one available package source - + click and set the path to nuget package in our local system. goto manage and we will see the new package source.. njoyyyy.. by Vasista Bhargav

How to change a DLL version ?

1. Right click on your project. 
2. Click properties. 
3. Go to the Application tab. 
4. Click Assembly Information. 
5. Change Assembly Version or / and File Version. 
6. Click OK. 
7. Click the save button. 
8. Recompile 
this is one way... njoyyyy.. by Vasista Bhargav

A potentially dangerous Request.Form value was detected from the client

Solution:  Add attribute [AllowHtml]

Resource file "Properties\Resources.resx" cannot be found

Solution: Right-click on the solution and go to resource tab click on add and save that's it 

How to encrypt in C# and decrypt in Apex

public class Program

{

private static byte[] cryptkey = Encoding.ASCII.GetBytes("01234567890123456789abcdefabcdef");

private static byte[] initVector = Encoding.ASCII.GetBytes("0123456789012359");

public static void Main()

{

var testo1 = "test";

var testo2 = "pippo\n";

string value = CryptAES(testo1);

Console.WriteLine("Crittare '{0}' produce: {1}", testo1, CryptAES(testo1));

Console.WriteLine("Crittare '{0}' produce: {1}", testo2, CryptAES(testo2));

Console.ReadLine();

}

public static string DecryptAES(string cipherData)

{

try

{

using (var rijndaelManaged =

new RijndaelManaged { Key = cryptkey, IV = initVector, Mode = CipherMode.CBC })

using (var memoryStream =

new MemoryStream(Convert.FromBase64String(cipherData)))

using (var cryptoStream =

new CryptoStream(memoryStream,

rijndaelManaged.CreateDecryptor(cryptkey, initVector),

CryptoStreamMode.Read))

{

return new StreamReader(cryptoStream).ReadToEnd();

}

}

catch (CryptographicException e)

{

Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);

return null;

}

}

public static string CryptAES(string textToCrypt)

{

try

{

using (var rijndaelManaged =

new RijndaelManaged { Key = cryptkey, IV = initVector, Mode = CipherMode.CBC })

using (var memoryStream = new MemoryStream())

using (var cryptoStream =

new CryptoStream(memoryStream,

rijndaelManaged.CreateEncryptor(cryptkey, initVector),

CryptoStreamMode.Write))

{

using (var ws = new StreamWriter(cryptoStream))

{

ws.Write(textToCrypt);

}

return Convert.ToBase64String(memoryStream.ToArray());

}

}

catch (CryptographicException e)

{

Console.WriteLine("A Cryptographic error occurred: {0}", e.Message);

return null;

}

}

}

LINQ TO ENTITY: Removing special characters inside the “where” expression

IEnumerable<Person> personsList = (from person in repoPersons.All()

         where person.Phone.Replace("+", "").Replace("(", "").Replace(")", "").Replace("-", "").Replace(" ", "").Contains(PhoneNumber)

         select person).ToList()

System.ComponentModel.Win32Exception: The specified service already exists

Installing windows service fails: service already exists
A connected answer finally pointed Maine within the right direction (why I did not realize that in Google or SO's own search i do not know). Anyway, apparently the Designer.cs generated by Visual Studio additionally creates a process- and service-installer. that in fact install services with an equivalent name as my manually created installers. Removing my very own installers resolved the matter.

all countrys list

<option value="Afghanistan">Afghanistan</option>
<option value="Albania">Albania</option>
<option value="Algeria">Algeria</option>
<option value="American Samoa">American Samoa</option>
<option value="Andorra">Andorra</option>
<option value="Angola">Angola</option>
<option value="Anguilla">Anguilla</option>
<option value="Antigua & Barbuda">Antigua & Barbuda</option>
<option value="Argentina">Argentina</option>
<option value="Armenia">Armenia</option>
<option value="Aruba">Aruba</option>
<option value="Australia">Australia</option>
<option value="Austria">Austria</option>
<option value="Azerbaijan">Azerbaijan</option>
<option value="Bahamas, The">Bahamas, The</option>
<option value="Bahrain">Bahrain</option>
<option value="Bangladesh">Bangladesh</option>
<option value="Barbados">Barbados</option>
<option value="Belarus">Belarus</option>
<option value="Belgium">Belgium</option>
<option value="Belize">Belize</option>
<option value="Benin">Benin</option>
<option value="Bermuda">Bermuda</option>
<option value="Bhutan">Bhutan</option>
<option value="Bolivia">Bolivia</option>
<option value="Bosnia & Herzegovina">Bosnia & Herzegovina</option>
<option value="Botswana">Botswana</option>
<option value="Brazil">Brazil</option>
<option value="British Virgin Is.">British Virgin Is.</option>
<option value="Brunei">Brunei</option>
<option value="Bulgaria">Bulgaria</option>
<option value="Burkina Faso">Burkina Faso</option>
<option value="Burma">Burma</option>
<option value="Burundi">Burundi</option>
<option value="Cambodia">Cambodia</option>
<option value="Cameroon">Cameroon</option>
<option value="Canada">Canada</option>
<option value="Cape Verde">Cape Verde</option>
<option value="Cayman Islands">Cayman Islands</option>
<option value="Central African Rep.">Central African Rep.</option>
<option value="Chad">Chad</option>
<option value="Chile">Chile</option>
<option value="China">China</option>
<option value="Colombia">Colombia</option>
<option value="Comoros">Comoros</option>
<option value="Congo, Dem. Rep.">Congo, Dem. Rep.</option>
<option value="Congo, Repub. of the">Congo, Repub. of the</option>
<option value="Cook Islands">Cook Islands</option>
<option value="Costa Rica">Costa Rica</option>
<option value="Cote d'Ivoire">Cote d'Ivoire</option>
<option value="Croatia">Croatia</option>
<option value="Cuba">Cuba</option>
<option value="Cyprus">Cyprus</option>
<option value="Czech Republic">Czech Republic</option>
<option value="Denmark">Denmark</option>
<option value="Djibouti">Djibouti</option>
<option value="Dominica">Dominica</option>
<option value="Dominican Republic">Dominican Republic</option>
<option value="East Timor">East Timor</option>
<option value="Ecuador">Ecuador</option>
<option value="Egypt">Egypt</option>
<option value="El Salvador">El Salvador</option>
<option value="Equatorial Guinea">Equatorial Guinea</option>
<option value="Eritrea">Eritrea</option>
<option value="Estonia">Estonia</option>
<option value="Ethiopia">Ethiopia</option>
<option value="Faroe Islands">Faroe Islands</option>
<option value="Fiji">Fiji</option>
<option value="Finland">Finland</option>
<option value="France">France</option>
<option value="French Guiana">French Guiana</option>
<option value="French Polynesia">French Polynesia</option>
<option value="Gabon">Gabon</option>
<option value="Gambia, The">Gambia, The</option>
<option value="Gaza Strip">Gaza Strip</option>
<option value="Georgia">Georgia</option>
<option value="Germany">Germany</option>
<option value="Ghana">Ghana</option>
<option value="Gibraltar">Gibraltar</option>
<option value="Greece">Greece</option>
<option value="Greenland">Greenland</option>
<option value="Grenada">Grenada</option>
<option value="Guadeloupe">Guadeloupe</option>
<option value="Guam">Guam</option>
<option value="Guatemala">Guatemala</option>
<option value="Guernsey">Guernsey</option>
<option value="Guinea">Guinea</option>
<option value="Guinea-Bissau">Guinea-Bissau</option>
<option value="Guyana">Guyana</option>
<option value="Haiti">Haiti</option>
<option value="Honduras">Honduras</option>
<option value="Hong Kong">Hong Kong</option>
<option value="Hungary">Hungary</option>
<option value="Iceland">Iceland</option>
<option value="India">India</option>
<option value="Indonesia">Indonesia</option>
<option value="Iran">Iran</option>
<option value="Iraq">Iraq</option>
<option value="Ireland">Ireland</option>
<option value="Isle of Man">Isle of Man</option>
<option value="Israel">Israel</option>
<option value="Italy">Italy</option>
<option value="Jamaica">Jamaica</option>
<option value="Japan">Japan</option>
<option value="Jersey">Jersey</option>
<option value="Jordan">Jordan</option>
<option value="Kazakhstan">Kazakhstan</option>
<option value="Kenya">Kenya</option>
<option value="Kiribati">Kiribati</option>
<option value="Korea, North">Korea, North</option>
<option value="Korea, South">Korea, South</option>
<option value="Kuwait">Kuwait</option>
<option value="Kyrgyzstan">Kyrgyzstan</option>
<option value="Laos">Laos</option>
<option value="Latvia">Latvia</option>
<option value="Lebanon">Lebanon</option>
<option value="Lesotho">Lesotho</option>
<option value="Liberia">Liberia</option>
<option value="Libya">Libya</option>
<option value="Liechtenstein">Liechtenstein</option>
<option value="Lithuania">Lithuania</option>
<option value="Luxembourg">Luxembourg</option>
<option value="Macau">Macau</option>
<option value="Macedonia">Macedonia</option>
<option value="Madagascar">Madagascar</option>
<option value="Malawi">Malawi</option>
<option value="Malaysia">Malaysia</option>
<option value="Maldives">Maldives</option>
<option value="Mali">Mali</option>
<option value="Malta">Malta</option>
<option value="Marshall Islands">Marshall Islands</option>
<option value="Martinique">Martinique</option>
<option value="Mauritania">Mauritania</option>
<option value="Mauritius">Mauritius</option>
<option value="Mayotte">Mayotte</option>
<option value="Mexico">Mexico</option>
<option value="Micronesia, Fed. St.">Micronesia, Fed. St.</option>
<option value="Moldova">Moldova</option>
<option value="Monaco">Monaco</option>
<option value="Mongolia">Mongolia</option>
<option value="Montserrat">Montserrat</option>
<option value="Morocco">Morocco</option>
<option value="Mozambique">Mozambique</option>
<option value="Namibia">Namibia</option>
<option value="Nauru">Nauru</option>
<option value="Nepal">Nepal</option>
<option value="Netherlands">Netherlands</option>
<option value="Netherlands Antilles">Netherlands Antilles</option>
<option value="New Caledonia">New Caledonia</option>
<option value="New Zealand">New Zealand</option>
<option value="Nicaragua">Nicaragua</option>
<option value="Niger">Niger</option>
<option value="Nigeria">Nigeria</option>
<option value="N. Mariana Islands">N. Mariana Islands</option>
<option value="Norway">Norway</option>
<option value="Oman">Oman</option>
<option value="Pakistan">Pakistan</option>
<option value="Palau">Palau</option>
<option value="Panama">Panama</option>
<option value="Papua New Guinea">Papua New Guinea</option>
<option value="Paraguay">Paraguay</option>
<option value="Peru">Peru</option>
<option value="Philippines">Philippines</option>
<option value="Poland">Poland</option>
<option value="Portugal">Portugal</option>
<option value="Puerto Rico">Puerto Rico</option>
<option value="Qatar">Qatar</option>
<option value="Reunion">Reunion</option>
<option value="Romania">Romania</option>
<option value="Russia">Russia</option>
<option value="Rwanda">Rwanda</option>
<option value="Saint Helena">Saint Helena</option>
<option value="Saint Kitts & Nevis">Saint Kitts & Nevis</option>
<option value="Saint Lucia">Saint Lucia</option>
<option value="St Pierre & Miquelon">St Pierre & Miquelon</option>
<option value="Saint Vincent and the Grenadines">Saint Vincent and the Grenadines</option>
<option value="Samoa">Samoa</option>
<option value="San Marino">San Marino</option>
<option value="Sao Tome & Principe">Sao Tome & Principe</option>
<option value="Saudi Arabia">Saudi Arabia</option>
<option value="Senegal">Senegal</option>
<option value="Serbia">Serbia</option>
<option value="Seychelles">Seychelles</option>
<option value="Sierra Leone">Sierra Leone</option>
<option value="Singapore">Singapore</option>
<option value="Slovakia">Slovakia</option>
<option value="Slovenia">Slovenia</option>
<option value="Solomon Islands">Solomon Islands</option>
<option value="Somalia">Somalia</option>
<option value="South Africa">South Africa</option>
<option value="Spain">Spain</option>
<option value="Sri Lanka">Sri Lanka</option>
<option value="Sudan">Sudan</option>
<option value="Suriname">Suriname</option>
<option value="Swaziland">Swaziland</option>
<option value="Sweden">Sweden</option>
<option value="Switzerland">Switzerland</option>
<option value="Syria">Syria</option>
<option value="Taiwan">Taiwan</option>
<option value="Tajikistan">Tajikistan</option>
<option value="Tanzania">Tanzania</option>
<option value="Thailand">Thailand</option>
<option value="Togo">Togo</option>
<option value="Tonga">Tonga</option>
<option value="Trinidad & Tobago">Trinidad & Tobago</option>
<option value="Tunisia">Tunisia</option>
<option value="Turkey">Turkey</option>
<option value="Turkmenistan">Turkmenistan</option>
<option value="Turks & Caicos Is">Turks & Caicos Is</option>
<option value="Tuvalu">Tuvalu</option>
<option value="Uganda">Uganda</option>
<option value="Ukraine">Ukraine</option>
<option value="United Arab Emirates">United Arab Emirates</option>
<option value="United Kingdom">United Kingdom</option>
<option value="United States">United States</option>
<option value="Uruguay">Uruguay</option>
<option value="Uzbekistan">Uzbekistan</option>
<option value="Vanuatu">Vanuatu</option>
<option value="Venezuela">Venezuela</option>
<option value="Vietnam">Vietnam</option>
<option value="Virgin Islands">Virgin Islands</option>
<option value="Wallis and Futuna">Wallis and Futuna</option>
<option value="West Bank">West Bank</option>
<option value="Western Sahara">Western Sahara</option>
<option value="Yemen">Yemen</option>
<option value="Zambia">Zambia</option>
<option value="Zimbabwe">Zimbabwe</option>