How to create more sheet then return message box success

Question

I work in visual studio 2015 using c# windows form

 

I create excel file 2007 using xlsx with more sheets but

 

i need to return messagebox success tell me that file created

 

So that how to return message box success that show after file excel created ?

 

mycode

public void CreateSheetIfNotExistsmemberAR()
        {
            using (System.Data.OleDb.OleDbConnection databaseConnection = new System.Data.OleDb.OleDbConnection())
            {

                DataTable schemaTable = default(DataTable);

                var fileName = string.Format("{0}\\Book3105", Directory.GetCurrentDirectory());
                var connection = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;" + "Data Source={0};Mode=ReadWrite;Extended Properties=Excel 12.0 Xml;", fileName);

                databaseConnection.ConnectionString = connection;
                databaseConnection.Open();

                schemaTable = databaseConnection.GetOleDbSchemaTable(System.Data.OleDb.OleDbSchemaGuid.Tables, new object[] {
            null,
            null,
            "Sheet3$"
        });

                if (schemaTable.Rows.Count == 0)
                {
                    string SQLDDLCommand = "CREATE TABLE [Sheet3] (MemberID INTEGER, MemberName NCHAR(255))";
                    System.Data.OleDb.OleDbCommand excelCommand = new System.Data.OleDb.OleDbCommand(SQLDDLCommand, databaseConnection);
                    excelCommand.ExecuteNonQuery();

                }

                databaseConnection.Close();
            }
        }