Standalone SQL Utility based off the one that is part of BinaryDigit.dll - https://github.com/Gordon-Beeming/BinaryDigit/blob/master/BinaryDigit/DataAccess/Sql.cs

SqlUtil.cs

/***************************************************************************\
Module Name:  SqlUtil.cs
Project:      GitHub Gist
Url:          http://go.beeming.net/28WaNE0

A sample class to interact with Microsoft SQL Server for all the basic data access layer operations.

The MIT License (MIT)

Copyright (c) Gordon Beeming

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
\***************************************************************************/
namespace MyApp.DataAccess
{
    using System;
    using System.Configuration;
    using System.Data;
    using System.Data.SqlClient;

    public static class SqlUtil
    {
        #region Delegates

        public delegate void DelegateSqlDataReaderRowWork(SqlDataReader reader);

        public delegate bool DelegateSqlWorkFailed(SqlWorkContext context);

        public delegate void DelegateSqlWorkSuccess(SqlWorkContext context);

        private delegate object DelegateCommonWork(SqlCommand command, SqlDataReader reader);

        #endregion

        #region Public Properties

        public static string DefaultConnectionString
        {
            get
            {
                if (ConfigurationManager.ConnectionStrings.Count > 0)
                {
                    return ConfigurationManager.ConnectionStrings[0].ConnectionString;
                }
                return null;
            }
        }

        #endregion

        #region Public Methods and Operators

        public static int ExecuteNonQuery(string sqlQuery, SqlParameter[] sqlParameters = null, CommandType sqlCommandType = CommandType.Text, int sqlCommandTimeout = 30, SqlTransaction sqlTransaction = null, DelegateSqlWorkSuccess success = null, DelegateSqlWorkFailed failed = null, bool startNewTransaction = false, string connectionString = null, string databaseName = null)
        {
            int result = -1;

            CommonWork((command, reader) =>
            {
                result = command.ExecuteNonQuery();
                return result;
            }, sqlQuery, sqlParameters, sqlCommandType, sqlCommandTimeout, sqlTransaction, success, failed, startNewTransaction, connectionString, databaseName);

            return result;
        }

        public static void ExecuteReader(DelegateSqlDataReaderRowWork worker, string sqlQuery, SqlParameter[] sqlParameters = null, CommandType sqlCommandType = CommandType.Text, int sqlCommandTimeout = 30, SqlTransaction sqlTransaction = null, DelegateSqlWorkSuccess success = null, DelegateSqlWorkFailed failed = null, bool startNewTransaction = false, string connectionString = null, string databaseName = null)
        {
            CommonWork((command, reader) =>
            {
                reader = command.ExecuteReader();
                if (worker != null)
                {
                    if (reader != null && reader.HasRows)
                    {
                        while (reader.Read())
                        {
                            worker(reader);
                        }
                    }
                }
                return null;
            }, sqlQuery, sqlParameters, sqlCommandType, sqlCommandTimeout, sqlTransaction, success, failed, startNewTransaction, connectionString, databaseName);
        }

        public static object ExecuteScalar(string sqlQuery, SqlParameter[] sqlParameters = null, CommandType sqlCommandType = CommandType.Text, int sqlCommandTimeout = 30, SqlTransaction sqlTransaction = null, DelegateSqlWorkSuccess success = null, DelegateSqlWorkFailed failed = null, bool startNewTransaction = false, string connectionString = null, string databaseName = null)
        {
            object result = null;

            CommonWork((command, reader) =>
            {
                result = command.ExecuteScalar();
                return result;
            }, sqlQuery, sqlParameters, sqlCommandType, sqlCommandTimeout, sqlTransaction, success, failed, startNewTransaction, connectionString, databaseName);

            return result;
        }

        public static T ExecuteScalar<T>(string sqlQuery, SqlParameter[] sqlParameters = null, CommandType sqlCommandType = CommandType.Text, int sqlCommandTimeout = 30, SqlTransaction sqlTransaction = null, DelegateSqlWorkSuccess success = null, DelegateSqlWorkFailed failed = null, bool startNewTransaction = false, string connectionString = null, string databaseName = null)
        {
            object result = null;

            CommonWork((command, reader) =>
            {
                result = command.ExecuteScalar();
                return result;
            }, sqlQuery, sqlParameters, sqlCommandType, sqlCommandTimeout, sqlTransaction, success, failed, startNewTransaction, connectionString, databaseName);

            return (T)result;
        }

        public static DataSet FetchDataSet(string sqlQuery, SqlParameter[] sqlParameters = null, CommandType sqlCommandType = CommandType.Text, int sqlCommandTimeout = 30, SqlTransaction sqlTransaction = null, DelegateSqlWorkSuccess success = null, DelegateSqlWorkFailed failed = null, bool startNewTransaction = false, string connectionString = null, string databaseName = null)
        {
            var result = new DataSet();

            SqlConnection connec = null;
            SqlCommand command = null;
            SqlDataAdapter adapter = null;
            try
            {
                connec = new SqlConnection(string.IsNullOrEmpty(connectionString) ? DefaultConnectionString : connectionString);
                connec.Open();
                if (!string.IsNullOrEmpty(databaseName))
                {
                    connec.ChangeDatabase(databaseName.TrimStart('[').TrimEnd(']'));
                }
                if (startNewTransaction)
                {
                    sqlTransaction = connec.BeginTransaction();
                }
                command = new SqlCommand(sqlQuery, connec);
                command.CommandTimeout = sqlCommandTimeout;
                command.CommandType = sqlCommandType;
                if (sqlTransaction != null)
                {
                    command.Transaction = sqlTransaction;
                }
                if (sqlParameters != null)
                {
                    foreach (SqlParameter sqlParameter in sqlParameters)
                    {
                        command.Parameters.Add(new SqlParameter(sqlParameter.ParameterName, sqlParameter.SqlDbType, sqlParameter.Size, sqlParameter.Direction, sqlParameter.Precision, sqlParameter.Scale, sqlParameter.SourceColumn, sqlParameter.SourceVersion, sqlParameter.SourceColumnNullMapping, sqlParameter.Value == null ? DBNull.Value : sqlParameter.Value, sqlParameter.XmlSchemaCollectionDatabase, sqlParameter.XmlSchemaCollectionOwningSchema, sqlParameter.XmlSchemaCollectionName));
                    }
                }

                adapter = new SqlDataAdapter();
                adapter.SelectCommand = command;
                adapter.Fill(result);

                if (success != null)
                {
                    success(new SqlWorkContext(sqlTransaction, result, command.Parameters, null));
                }
            }
            catch (Exception ex)
            {
                if (failed != null)
                {
                    if (!failed(new SqlWorkContext(sqlTransaction, null, command.Parameters, ex)))
                    {
                        throw;
                    }
                }
                else
                {
                    throw;
                }
            }
            finally
            {
                if (adapter != null)
                {
                    adapter.Dispose();
                    adapter = null;
                }
                if (command != null)
                {
                    command.Dispose();
                    command = null;
                }
                if (connec != null)
                {
                    if (connec.State != ConnectionState.Closed)
                    {
                        connec.Close();
                    }
                    connec.Dispose();
                    connec = null;
                }
            }

            return result;
        }

        public static DataTable FetchDataTable(string sqlQuery, SqlParameter[] sqlParameters = null, CommandType sqlCommandType = CommandType.Text, int sqlCommandTimeout = 30, SqlTransaction sqlTransaction = null, DelegateSqlWorkSuccess success = null, DelegateSqlWorkFailed failed = null, bool startNewTransaction = false, string connectionString = null, string databaseName = null)
        {
            var result = new DataTable();

            CommonWork((command, reader) =>
            {
                reader = command.ExecuteReader();
                if (reader != null)
                {
                    //result.Load(reader, LoadOption.OverwriteChanges, new FillErrorEventHandler((obj, args) =>
                    //{
                    //    args.Continue = true;//This is done for when you are selecting * and a UDT is within the results.
                    //}));
                    result.Load(reader, LoadOption.OverwriteChanges);
                    //result.Load(reader);
                }
                return result;
            }, sqlQuery, sqlParameters, sqlCommandType, sqlCommandTimeout, sqlTransaction, success, failed, startNewTransaction, connectionString, databaseName);

            return result;
        }

        #endregion

        #region Methods

        private static void CommonWork(DelegateCommonWork work, string sqlQuery, SqlParameter[] sqlParameters, CommandType sqlCommandType, int sqlCommandTimeout, SqlTransaction sqlTransaction, DelegateSqlWorkSuccess success, DelegateSqlWorkFailed failed, bool startNewTransaction, string connectionString, string databaseName)
        {
            SqlConnection connec = null;
            SqlCommand command = null;
            SqlDataReader reader = null;
            try
            {
                connec = new SqlConnection(string.IsNullOrEmpty(connectionString) ? DefaultConnectionString : connectionString);
                connec.Open();
                if (!string.IsNullOrEmpty(databaseName))
                {
                    connec.ChangeDatabase(databaseName.TrimStart('[').TrimEnd(']'));
                }
                if (startNewTransaction)
                {
                    sqlTransaction = connec.BeginTransaction();
                }
                command = new SqlCommand(sqlQuery, connec);
                command.CommandTimeout = sqlCommandTimeout;
                command.CommandType = sqlCommandType;
                if (sqlTransaction != null)
                {
                    command.Transaction = sqlTransaction;
                }
                if (sqlParameters != null)
                {
                    foreach (SqlParameter sqlParameter in sqlParameters)
                    {
                        command.Parameters.Add(new SqlParameter(sqlParameter.ParameterName, sqlParameter.SqlDbType, sqlParameter.Size, sqlParameter.Direction, sqlParameter.Precision, sqlParameter.Scale, sqlParameter.SourceColumn, sqlParameter.SourceVersion, sqlParameter.SourceColumnNullMapping, sqlParameter.Value == null ? DBNull.Value : sqlParameter.Value, sqlParameter.XmlSchemaCollectionDatabase, sqlParameter.XmlSchemaCollectionOwningSchema, sqlParameter.XmlSchemaCollectionName));
                    }
                }

                if (work != null)
                {
                    if (success != null)
                    {
                        success(new SqlWorkContext(sqlTransaction, work(command, reader), command.Parameters, null));
                    }
                    else
                    {
                        work(command, reader);
                    }
                }
                else
                {
                    if (success != null)
                    {
                        success(new SqlWorkContext(sqlTransaction, null, command.Parameters, null));
                    }
                }
            }
            catch (Exception ex)
            {
                if (failed != null)
                {
                    if (!failed(new SqlWorkContext(sqlTransaction, null, command.Parameters, ex)))
                    {
                        throw;
                    }
                }
                else
                {
                    throw;
                }
            }
            finally
            {
                if (reader != null)
                {
                    reader.Close();
                    reader.Dispose();
                    reader = null;
                }
                if (command != null)
                {
                    command.Dispose();
                    command = null;
                }
                if (connec != null)
                {
                    if (connec.State != ConnectionState.Closed)
                    {
                        connec.Close();
                    }
                    connec.Dispose();
                    connec = null;
                }
            }
        }

        #endregion

        public struct SqlWorkContext
        {
            #region Fields

            public SqlTransaction CurrentSqlTransaction;

            public Exception Error;

            public object Result;

            public SqlParameterCollection SqlParameters;

            #endregion

            #region Constructors and Destructors

            public SqlWorkContext(SqlTransaction sqlTransaction, object result, SqlParameterCollection sqlParameters, Exception error)
            {
                this.CurrentSqlTransaction = sqlTransaction;
                this.Result = result;
                this.SqlParameters = sqlParameters;
                this.Error = error;
            }

            #endregion
        }
    }
}