Error occurred during a cryptographic operation. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Security.Cryptography.CryptographicException: Error occurred during a cryptographic operation.

Server Error in '/' Application.

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Error occurred during a cryptographic operation.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Security.Cryptography.CryptographicException: Error occurred during a cryptographic operation.

Source Error:

Line 53: //var prin = new GenericPrincipal(id, userRoles); Line 54: //HttpContext.Current.User = prin; Line 55: var ticket = FormsAuthentication.Decrypt(encTicket); Line 56: var id = new UserIdentity(ticket); Line 57: string[] userRoles = { "A" };

Source File: c:\Naresh\                                        Global.asax.cs    Line: 55

Stack Trace:

[CryptographicException: Error occurred during a cryptographic operation.] System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.Homogen izeErrors(Func`2 func, Byte[] input) +115 System.Web.Security.Cryptography.HomogenizingCryptoServiceWrapper.Unprot ect(Byte[] protectedData) +70 System.Web.Security.FormsAuthentication.Decrypt(String encryptedTicket) +9692626 CanPayApp.MvcApplication.MvcApplication_PostAuthenticateRequest(Object sender, EventArgs e) in c:\Naresh\05 31 2016\CanPayApp\CanPayApp\Global .asax.cs:55 System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecut ionStep.Execute() +141 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +69

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Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.6.1055.0

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=Cleanup code and open... 

For anyone who hasn't solved their problem, I was missing the "machineKey" entry for encrypt/decrypt in my web.config

=Try clearing your cache and cookies in order to mitigate the error. I suspect some sort of error occurred when information was sent to or from the server.

The localhost page isn’t working in visual studio

Resolved::: solution> project properties> change iis express port number ----

Convert Datatable to List

private static List<T> ConvertDataTable<T>(DataTable dt)  

{  

    List<T> data = new List<T>();  

    foreach (DataRow row in dt.Rows)  

    {  

        T item = GetItem<T>(row);  

        data.Add(item);  

    }  

    return data;  

}  

private static T GetItem<T>(DataRow dr)  

{  

    Type temp = typeof(T);  

    T obj = Activator.CreateInstance<T>();  

  

    foreach (DataColumn column in dr.Table.Columns)  

    {  

        foreach (PropertyInfo pro in temp.GetProperties())  

        {  

            if (pro.Name == column.ColumnName)  

                pro.SetValue(obj, dr[column.ColumnName], null);  

            else  

                continue;  

        }  

    }  

    return obj;  

} 

Visual Studio Expand/Collapse keyboard shortcuts

Collapse to Definitions: CTRL + M + O

Expand all Outlining: CTRL + M + X

Not Running in Release Mode in Visual Studio

• Right click Project
• Properties
• Build
• Advanced
• Set Debug Info to full or pdb only

Difference Between "string" and "String"

what is the difference between both (String and string)? After completing the execution of this program when we mouse over on string is shows class System.String and  when we mouse over on String it also shows Class System.String. Class System.String statement clarifying that string is the alias name of String.

Finally:

String is the alias name of String because both contain the same things 

Difference Between "string" and "String"

what is the difference between both (String and string)? After completing the execution of this program when we mouse over on string is shows class System.String and  when we mouse over on String it also shows Class System.String. Class System.String statement clarifying that string is the alias name of String.

Finally:

String is the alias name of String because both contain the same things 

Convert Number To Word

public string ConvertNumbertoWords(int number)

       {

           if (number == 0)

               return "ZERO";

           if (number < 0)

               return "minus " + ConvertNumbertoWords(Math.Abs(number));

           string words = "";

           if ((number/1000000) > 0)

           {

               words += ConvertNumbertoWords(number/1000000) + " MILLION ";

               number %= 1000000;

           }

           if ((number/1000) > 0)

           {

               words += ConvertNumbertoWords(number/1000) + " THOUSAND ";

               number %= 1000;

           }

           if ((number/100) > 0)

           {

               words += ConvertNumbertoWords(number/100) + " HUNDRED ";

               number %= 100;

           }

           if (number > 0)

           {

               if (words != "")

                   words += "AND ";

               var unitsMap = new[]

               {

                   "ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE", "TEN", "ELEVEN",

                   "TWELVE", "THIRTEEN", "FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN", "NINETEEN"

               };

               var tensMap = new[]

               {"ZERO", "TEN", "TWENTY", "THIRTY", "FORTY", "FIFTY", "SIXTY", "SEVENTY", "EIGHTY", "NINETY"};

               if (number < 20)

                   words += unitsMap[number];

               else

               {

                   words += tensMap[number/10];

                   if ((number%10) > 0)

                       words += " " + unitsMap[number%10];

               }

           }

           return words;

       }

Difference between TextBox and TextBoxFor:

@Html.TextBox() is loosely typed method whereas @Html.TextBoxFor() is a strongly typed (generic) extension method.
TextBox() requires property name as string parameter where as TextBoxFor() requires lambda expression as a parameter.
TextBox doesn't give you compile time error if you have specified wrong property name. It will throw run time exception.
TextBoxFor is generic method so it will give you compile time error if you have specified wrong property name or property name changes. (Provided view is not compile at run time. )

Convert List to Dataset

       public DataSet ToDataSet<T>(IList<T> list)

       {

           Type elementType = typeof(T);

           using (DataSet ds = new DataSet())

           {

               using (DataTable t = new DataTable())

               {

                   ds.Tables.Add(t);

                   //add a column to table for each public property on T

                   PropertyInfo[] _props = elementType.GetProperties();

                   foreach (PropertyInfo propInfo in _props)

                   {

                       Type _pi = propInfo.PropertyType;

                       Type ColType = Nullable.GetUnderlyingType(_pi) ?? _pi;

                       t.Columns.Add(propInfo.Name, ColType);

                   }

                   //go through each property on T and add each value to the table

                   foreach (T item in list)

                   {

                       DataRow row = t.NewRow();

                       foreach (PropertyInfo propInfo in _props)

                       {

                           row[propInfo.Name] = propInfo.GetValue(item, null) ??                                       DBNull.Value;

                       }

                       t.Rows.Add(row);

                   }

               }

               return ds;

           }