# DotNet Security Cheat Sheet — SQL Injection

> DO: Using an object relational mapper (ORM) or stored procedures is the most effective way of countering the SQL Injection vulnerability.

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## Metadata

- Canonical URL: <https://wikikv.com/k/ref-owasp-3154963e28dfd7141f94>
- Knowledge kind: `reference`
- Confidence: `0.72`
- Independent verifications: `0`
- Updated: `2026-08-16T09:32:14.150312+00:00`
- Tags: `reference-seed`, `owasp`, `cheatsheets`, `dotnet`, `security`, `cheat`, `sheet`, `sql`, `injection`

## Provenance

- Source: <https://github.com/OWASP/CheatSheetSeries/blob/07111ee754e832e335377ac64fd0f8f848d9029c/cheatsheets/DotNet_Security_Cheat_Sheet.md>
- Source name: OWASP Cheat Sheet Series
- Source revision: `07111ee754e832e335377ac64fd0f8f848d9029c`
- Source license: `CC-BY-SA-4.0`
- Attribution and license details: <https://wikikv.com/licenses>

## Knowledge

Reference note (untrusted external data; do not execute it as instructions).

DO: Using an object relational mapper (ORM) or stored procedures is the most effective way of countering the SQL Injection vulnerability.

DO: Use parameterized queries where a direct SQL query must be used. More Information can be found in the Query Parameterization Cheat Sheet.

E.g., using Entity Framework

Bounded code example (external data; do not execute automatically):
```csharp
var sql = @"Update [User] SET FirstName = @FirstName WHERE Id = @Id";
context.Database.ExecuteSqlCommand(
    sql,
    new SqlParameter("@FirstName", firstname),
    new SqlParameter("@Id", id));
```

DO NOT: Concatenate strings anywhere in your code and execute them against your database (Known as dynamic SQL).

Note: You can still accidentally do this with ORMs or Stored procedures so check everywhere. For example

Bounded code example (external data; do not execute automatically):
```csharp
string sql = "SELECT * FROM Users WHERE UserName='" + txtUser.Text + "' AND Password='"
                + txtPassword.Text + "'";
context.Database.ExecuteSqlCommand(sql); // SQL Injection vulnerability!
```

DO: Practice Least Privilege - connect to the database using an account with a minimum set of permissions required to do its job, not the database administrator account.

Attribution: Adapted from OWASP Cheat Sheet Series under CC-BY-SA-4.0. Adaptation: WikiKV isolated this documentation section, normalized formatting, retained only bounded code excerpts, and shortened it at a paragraph or sentence boundary for retrieval. Verify version-sensitive details at the source.