How would you manage promotion from dev to staging to production for a .NET application?

Environment promotion from dev to staging to production

Explains promoting artifacts through dev, staging, and production while managing configuration differences safely.

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I build the application once, create a versioned artifact, and promote that same artifact through dev, staging, and production. The code package stays the same; environment-specific configuration changes through approved configuration, Key Vault references, feature flags, and deployment settings. Dev is useful for quick validation, staging is where I want production-like checks, and production is where rollout and monitoring matter most. This reduces drift because we are not rebuilding or manually changing the application at each stage.

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Environment promotion, artifact consistency, configuration, approvals, smoke checks, and drift prevention.

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Why this question matters
Environment promotion is where many teams accidentally introduce drift by rebuilding or configuring each environment differently.
I build the application once, create a versioned artifact, and promote that same artifact through dev, staging, and production. The code package stays the same; environment-specific configuration changes through approved configuration, Key Vault references, feature flags, and deployment settings. Dev is useful for quick validation, staging is where I want production-like checks, and production is where rollout and monitoring matter most. This reduces drift because we are not rebuilding or manually changing the application at each stage.
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For example, a .NET API artifact built from commit abc123 can deploy to dev, then staging, then production. Connection strings, Key Vault references, feature flags, and scaling settings differ by environment. The trade-off is that perfect environment parity is expensive, but the deployment mechanism and configuration structure should be consistent enough to catch problems before production.

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Rebuilding separately per environment.
Manually changing production settings in the portal.
Using production secrets in lower environments.
Treating staging as unrelated to production.

How would you manage promotion from dev to staging to production for a .NET application?

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How would you manage promotion from dev to staging to production for a .NET application?

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