How to avoid the error "There is no argument given that corresponds to the required formal parameter"?

Question

I am working on csharp, but I found the following warning message:

Error CS7036 There is no
 argument given that corresponds to the required formal parameter
 'errorMsg' of 'ErrorEventArg.ErrorEventArg(string,
 string)' MSSQLTest C:\Users\Administrator\Desktop\MSSQLTest\MSSQLTest\MSSQLConnection.cs 61

Is there any way to stabilize the issue “There is no argument given that corresponds to the required formal parameter”? I read a lot of topics about this, but all of them were trying to install anything. Is this the correct way, or any recommendation for me? Please find the beginning command below:

using System;
 using System.Collections.Generic;
 using System.Data.SqlClient;
 using System.Threading;
 
 namespace MSSQLTest
 {
  public class ErrorEventArg : EventArgs
  {
  public string ErrorMsg { get; set; }
  public string LastQuery { get; set; }
 
  public ErrorEventArg(string errorMsg, string lastQuery)
  {
  ErrorMsg = errorMsg;
  LastQuery = lastQuery;
  }
  }
 
  public class MSSQLConnection
  {
  /// <summary>
  /// Private class objects.
  /// </summary>
  private SqlConnection sqlConnection;
  private int sqlCommandTimeout;
  private string lastQuery = string.Empty;
 
  /// <summary>
  /// Public event related objects & handler.
  /// </summary>
  public event ErrorHandler OnError;
  public delegate void ErrorHandler(MSSQLConnection sender, ErrorEventArg e);
 
  /// <summary>
  /// Class constructor.
  /// </summary>
  /// <param name="sqlConnection"></param>
  /// <param name="sqlCommandTimeout"></param>
  public MSSQLConnection(SqlConnection sqlConnection, Int32 sqlCommandTimeout = 120)
  {
  if (null == sqlConnection)
  throw new Exception("Invalid MSSQL Database Conection Handle");
 
  if (sqlConnection.State != System.Data.ConnectionState.Open)
  throw new Exception("MSSQL Database Connection Is Not Open");
 
  this.sqlConnection = sqlConnection;
  this.sqlCommandTimeout = sqlCommandTimeout;
  }
 
  /// <summary>
  /// Helper method to emit a database error to event subscribers.
  /// </summary>
  /// <param name="errorMsg"></param>
  internal void EmitError(String errorMsg)
  {
  var errorDelegate = OnError;
  if (errorDelegate != null)
  {
  errorDelegate(this, new ErrorEventArg() // Line #61
  {
  ErrorMsg = errorMsg,
  LastQuery = lastQuery
  });
  }
  }
  
  /// rest of the code snipped
  }
 }

dttutoria · Accepted Answer

The cause: Because the old MSSQL Connection helper library was refactored, or because a default constructor was not created, you get the error: There is no argument given that corresponds to the required formal parameter

Solution: You've had a constructor with two parameters. You ought to write a short code like:

new ErrorEventArg(errorMsv, lastQuery)

Alternatively, you may write a default constructor for ErrorEventArg that takes no parameters, such as this:

public ErrorEventArg() {}

Zoé Renard · Answer

The constructor of

public class ErrorEventArg : EventArgs

You will need to add "base" in the following order:

public ErrorEventArg(string errorMsg, string lastQuery) : base (string errorMsg, string lastQuery)
{
 ErrorMsg = errorMsg;
 LastQuery = lastQuery;
}

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How to avoid the error “There is no argument given that corresponds to the required formal parameter”?