EditorConfig file for .NET projects based on C# or VB + Markdown documentation (see more details here https://docs.microsoft.com/en-us/visualstudio/ide/editorconfig-code-style-settings-reference?view=vs-2019#expression_level_csharp)

.editorconfig

###############################
# Core EditorConfig Options   #
###############################

root = true

# All files
[*]
charset = utf-8

# Markdown files
[*.md]
charset = utf-8
indent_style = space
indent_size = 4
end_of_line = lf
trim_trailing_whitespace = true
insert_final_newline = true

# Code files (.NET)
[*.{cs,csx,vb,vbx}]

# Indentation and spacing
indent_size = 4
indent_style = space
tab_width = 4

# New line preferences
end_of_line = crlf
insert_final_newline = false

###############################
# .NET Coding Conventions     #
###############################

[*.{cs,vb}]
# Organize usings
dotnet_sort_system_directives_first = true
dotnet_separate_import_directive_groups = false

# this. and Me. preferences
dotnet_style_qualification_for_field = false:silent
dotnet_style_qualification_for_property = false:silent
dotnet_style_qualification_for_method = false:silent
dotnet_style_qualification_for_event = false:silent

# Language keywords vs BCL types preferences
dotnet_style_predefined_type_for_locals_parameters_members = true:silent
dotnet_style_predefined_type_for_member_access = true:silent

# Parentheses preferences
dotnet_style_parentheses_in_arithmetic_binary_operators = always_for_clarity:silent
dotnet_style_parentheses_in_relational_binary_operators = always_for_clarity:silent
dotnet_style_parentheses_in_other_binary_operators = always_for_clarity:silent
dotnet_style_parentheses_in_other_operators = never_if_unnecessary:silent

# Modifier preferences
dotnet_style_require_accessibility_modifiers = for_non_interface_members:silent
dotnet_style_readonly_field = true:suggestion

# Expression-level preferences
dotnet_style_object_initializer = true:suggestion
dotnet_style_collection_initializer = true:suggestion
dotnet_style_explicit_tuple_names = true:suggestion
dotnet_style_null_propagation = true:suggestion
dotnet_style_coalesce_expression = true:suggestion
dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
dotnet_style_prefer_inferred_tuple_names = true:suggestion
dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
dotnet_style_prefer_auto_properties = true:silent
dotnet_style_prefer_conditional_expression_over_assignment = true:silent
dotnet_style_prefer_conditional_expression_over_return = true:silent
dotnet_style_prefer_compound_assignment = true:suggestion

# Parameter preferences
dotnet_code_quality_unused_parameters = all:suggestion

###############################
# Naming Conventions          #
###############################

# Style Definitions
dotnet_naming_style.pascal_case_style.capitalization = pascal_case

# Use PascalCase for constant fields
dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
dotnet_naming_rule.constant_fields_should_be_pascal_case.symbols  = constant_fields
dotnet_naming_rule.constant_fields_should_be_pascal_case.style    = pascal_case_style
dotnet_naming_symbols.constant_fields.applicable_kinds            = field
dotnet_naming_symbols.constant_fields.applicable_accessibilities  = *
dotnet_naming_symbols.constant_fields.required_modifiers          = const

###############################
# C# Code Style Rules         #
###############################

[*.cs]
# var preferences
csharp_style_var_for_built_in_types = true:silent
csharp_style_var_when_type_is_apparent = true:silent
csharp_style_var_elsewhere = true:silent

# Expression-bodied members
csharp_style_expression_bodied_methods = false:silent
csharp_style_expression_bodied_constructors = false:silent
csharp_style_expression_bodied_operators = false:silent
csharp_style_expression_bodied_properties = true:silent
csharp_style_expression_bodied_indexers = true:silent
csharp_style_expression_bodied_accessors = true:silent
csharp_style_expression_bodied_lambdas = true:silent
csharp_style_expression_bodied_local_functions = false:silent

# Pattern-matching preferences
csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
csharp_style_pattern_matching_over_as_with_null_check = true:suggestion

# Null-checking preferences
csharp_style_throw_expression = true:suggestion
csharp_style_conditional_delegate_call = true:suggestion

# Modifier preferences
csharp_preferred_modifier_order = public,private,protected,internal,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,volatile,async:suggestion

# Code-block preferences
csharp_prefer_braces = true:silent

# Expression-level preferences
csharp_prefer_simple_default_expression = true:suggestion
csharp_style_pattern_local_over_anonymous_function = true:suggestion
csharp_style_prefer_index_operator = true:suggestion
csharp_style_prefer_range_operator = true:suggestion
csharp_style_unused_value_assignment_preference = discard_variable:suggestion
csharp_style_unused_value_expression_statement_preference = discard_variable:silent
csharp_style_deconstructed_variable_declaration = true:suggestion
csharp_style_inlined_variable_declaration = true:suggestion

###############################
# C# Formatting Rules         #
###############################

# New line preferences
csharp_new_line_before_open_brace = all
csharp_new_line_before_else = true
csharp_new_line_before_catch = true
csharp_new_line_before_finally = true
csharp_new_line_before_members_in_object_initializers = true
csharp_new_line_before_members_in_anonymous_types = true
csharp_new_line_between_query_expression_clauses = true

# Indentation preferences
csharp_indent_case_contents = true
csharp_indent_switch_labels = true
csharp_indent_labels = flush_left
csharp_indent_block_contents = true
csharp_indent_braces = false
csharp_indent_case_contents_when_block = true

# Space preferences
csharp_space_after_cast = false
csharp_space_after_keywords_in_control_flow_statements = true
csharp_space_after_colon_in_inheritance_clause = true
csharp_space_after_comma = true
csharp_space_after_dot = false
csharp_space_after_semicolon_in_for_statement = true
csharp_space_around_binary_operators = before_and_after
csharp_space_around_declaration_statements = false
csharp_space_before_colon_in_inheritance_clause = true
csharp_space_before_comma = false
csharp_space_before_dot = false
csharp_space_before_open_square_brackets = false
csharp_space_before_semicolon_in_for_statement = false
csharp_space_between_empty_square_brackets = false
csharp_space_between_method_call_empty_parameter_list_parentheses = false
csharp_space_between_method_call_name_and_opening_parenthesis = false
csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
csharp_space_between_method_declaration_name_and_open_parenthesis = false
csharp_space_between_method_declaration_parameter_list_parentheses = false
csharp_space_between_parentheses = false
csharp_space_between_square_brackets = false

# Wrapping preferences
csharp_preserve_single_line_statements = true
csharp_preserve_single_line_blocks = true

##################################
# Visual Basic Code Style Rules  #
##################################

[*.vb]
# Modifier preferences
visual_basic_preferred_modifier_order = Partial,Default,Private,Protected,Public,Friend,NotOverridable,Overridable,MustOverride,Overloads,Overrides,MustInherit,NotInheritable,Static,Shared,Shadows,ReadOnly,WriteOnly,Dim,Const,WithEvents,Widening,Narrowing,Custom,Async:suggestion