Acme.Northwind.EFDAL.NorthwindEntities.SelectExtendedProperty C# (CSharp) Method

		private static string SelectExtendedProperty(string connectionString, string property, string user, string table, string parameter)
		{
			var returnVal = string.Empty;
			var userName = string.Empty;
			var userValue = string.Empty;
			var tableName = string.Empty;
			var tableValue = string.Empty;
			var columnName = string.Empty;
			var columnValue = string.Empty;

			property = "'" + property + "'";
			if (user == string.Empty)
			{
				userName = "NULL";
				userValue = "NULL";
			}
			else
			{
				userName = "'user'";
				userValue = "'" + user + "'";
			}
			if (table == string.Empty)
			{
				tableName = "NULL";
				tableValue = "NULL";
			}
			else
			{
				tableName = "'table'";
				tableValue = "'" + table + "'";
			}
			if (parameter == string.Empty)
			{
				columnName = "NULL";
				columnValue = "NULL";
			}
			else
			{
				columnName = "'parameter'";
				columnValue = "'" + parameter + "'";
			}

			System.Data.SqlClient.SqlConnection conn = new System.Data.SqlClient.SqlConnection();
			System.Data.SqlClient.SqlDataReader externalReader = null;
			try
			{
				conn.ConnectionString = connectionString;
				conn.Open();
				var cmdGetExtProp = new System.Data.SqlClient.SqlCommand();
				cmdGetExtProp.CommandText = String.Format("SELECT value FROM ::fn_listextendedproperty({0}, {1}, {2}, {3}, {4}, {5}, {6})", new object[] { property, userName, userValue, tableName, tableValue, columnName, columnValue });
				cmdGetExtProp.CommandType = System.Data.CommandType.Text;
				cmdGetExtProp.Connection = conn;
				externalReader = cmdGetExtProp.ExecuteReader();
				if (externalReader.Read())
				{
					if (externalReader[0] != System.DBNull.Value)
					{
						returnVal = externalReader.GetString(0);
					}
				}
			}
			catch (Exception ex)
			{
				throw ex;
			}
			finally
			{
				if (externalReader != null)
					externalReader.Close();
				if (conn != null)
					conn.Close();
			}
			return returnVal;
		}