MsSqlConnectionStringTester

A lightweight Windows Forms utility for testing MS SQL Server connection strings — by hand or in bulk from an appsettings.json file — and running ad-hoc queries directly from the UI.

Requirements

• Windows
• .NET 10 SDK

Build & Run

cd SQLConnCheck
dotnet run

Or build a self-contained executable:

dotnet publish -c Release -r win-x64 --self-contained

Features

Manual connection test

Paste any MS SQL Server connection string into the Connection String box and click Test Connection. The result appears immediately below.

Data Source=.\SQLEXPRESS;Initial Catalog=MyDB;User ID=sa;Password=secret;

Batch test from appsettings.json

Click Browse appsettings.json, select a file, then click Test All. Every entry under the "ConnectionStrings" section is tested in sequence; a live summary updates as each result arrives.

{
  "ConnectionStrings": {
    "Default":    "Server=localhost;Database=App;Trusted_Connection=True;",
    "Reporting":  "Server=rep-srv;Database=Reports;User Id=sa;Password=pass;"
  }
}

Execute Query

Type any SQL in the Query box and click Execute Query. Results are rendered as plain text with a pipe-separated header row, a separator line, and a row count at the bottom — no connection to a separate database tool required.

Id  |  Name  |  CreatedAt
--------------------------
1   |  Alice  |  2024-01-15
2   |  Bob    |  2024-03-22
(2 row(s) returned)

Result colors

Color	Meaning
Dark green	Connection succeeded
Dark red	Connection failed (error detail shown)