How to generate and verify GUID for C#/.NET/SQL Server

When this guide is useful

This is for users who want to perform GUID generation, C# GUID batch generation, data creation for SQL Server unique identifier, GUID format conversion, and confirmation of Guid.ToByteArray using a browser.

• Prepare multiple Guid values for C# test data
• Create an INSERT statement to insert into the unique identifier column of SQL Server
• Check the cause of the mismatch between the external system and GUID byte strings

Criteria for choosing .NET GUID format

• D is a common hyphen, N is 32 digits, B is curly braces, P is parentheses, X is a hexadecimal structure format
• The value passed to SQL Server's unique identifier is usually in D format, which is easy to handle.
• Guid.ToByteArray() makes the first 3 fields little endian
• NEWSEQUENTIALID() is generated on the SQL Server side and cannot be reproduced in the browser.

Steps to generate and verify GUIDs

1. Select
2. Additional information: C# VB.NET PowerShell SQL Server
3. Generate a GUID, check the count and no duplicates, and copy or save.
4. Paste the existing value into the validation field and check Version, Variant, Guid.Empty, and byte order.

Notes on passing GUIDs between systems

Even if the GUID strings are the same, their order may differ depending on how they are converted to 16 bytes. Check the endianness expected by your database, API, and file specifications.

GUIDs can be used as hard-to-guess identifiers, but they are not a substitute for private keys, access tokens, or authorization decisions.

Specific example: Creating GUIDs for SQL Server input all at once

When inputting multiple rows to the uniqueidentifier column of the test table, you can reduce transcription errors by outputting them all in INSERT format rather than creating GUIDs one by one.

After generation, confirm that there are no duplicates, replace it with the actual table name and column name, and run it in the test environment.

1. Select the number of generated items and D format.
2. Select SQL Server INSERT statement in bulk output format.
3. Generate and check that there are 0 duplicates.
4. Replace target_table and guid_value in the output with the target name.

Additional information: GUID

Frequently asked questions

Are GUIDs and UUIDs different?

GUID is a UUID-compatible 128-bit identifier widely used in Microsoft products. This tool focuses on .NET-specific notation and byte ordering.

Will the generated GUID be sent to the server?

Generation, format conversion, validation, and file creation occur within the browser and are not sent to the Develop Tools server.