| U - Data Type Suffix |
| u - Data Type Suffix |
| UBound - Microsoft.VisualBasic.Information. |
| UCase Method - VB.Net |
| udl (data link file) |
| uint (UInt32) |
| UInt16 |
| UInt32 |
| UInt64 |
| UInteger (VB.Net) |
| ulong (UInt64) |
| ULong (VB.Net) |
| Unary Expression |
| Unary Operators |
| Unboxing |
| Unboxing Types |
| unchecked Keyword |
| Underlining - Blue |
| Underlining - Green |
| Underlining - Purple |
| Underlining - Red |
| Unicode Transformation Format (UTF) |
| Uniform Resource Identifier (URI) |
| Union Operator |
| Unit Testing |
| Unit Tests |
| Units - Centimeters |
| Units - Characters |
| Units - Inches |
| Units - Millimeters |
| Units - Pixels |
| Units - Points |
| Units - Twips |
| Units of Measure |
| UnitTesting.Assert |
| UnitTesting.CollectionAssert |
| UnitTesting.StringAssert |
| UnmanagedType - System.Runtime.InteropServices. |
| unsafe Keyword |
| Unsigned Integers |
| Unsigned Variable Types |
| Updating VSTO Add-ins |
| UploadFile - System.Net.WebClient. |
| Uri - System. |
| URI (Uniform Resource Identifier) |
| URL Encoding |
| User Defined Structs |
| User Defined Types - structs |
| User Settings |
| User Settings File |
| User Specific Application Settings |
| User.config |
| UserControl - Windows Forms |
| ushort (UInt16) |
| UShort (VB.Net) |
| using |
| Using Directive |
| using Statements |
| Using Statements (VB.Net) |
| UTC (Coordinated Universal Time) |
| Utc.Id - System.TimeZoneInfo. |
| UTF (Unicode Transformation Format) |
| UTF-8 Encoding |
| Utf8JsonReader |
| Utf8JsonWriter |
| Utilities |
| Utilities - addinutil |
| Utilities - al |
| Utilities - aximp |
| Utilities - caspol |
| Utilities - certmgr |
| Utilities - fuslogve |
| Utilities - gacutil |
| Utilities - guidgen |
| Utilities - ildasm |
| Utilities - mage |
| Utilities - mscorcfg |
| Utilities - oleview |
| Utilities - regasm |
| Utilities - regsvr32 |
| Utilities - sgen |
| Utilities - sn |
| Utilities - svcutil |
| Utilities - tlbexp |
| Utilities - tlbimp |
| Utilities - wsdl |
| Utilities - xsd |