validation with function

images/win/scripts/Installers/Validate-SQLExpress.ps1

@@ -1,15 +1,33 @@
-$sqlConn = New-Object System.Data.SqlClient.SqlConnection
-$sqlConn.ConnectionString = "Server=$env:computername\SQL2019;Integrated Security=false;User ID=sa; Password=P@ssword!!"
-$sqlConn.Open()
-$str1=""
-$sqlConn.State
-IF (Compare-Object $sqlConn.State $str1)
-{
-Write-Host "Failed attempt"
-exit 1
+function Test-SqlConnection {
+    param(
+        [Parameter(Mandatory)]
+        [string]$ServerName,
+
+        [Parameter(Mandatory)]
+        [string]$IntegratedSecurity,
+
+        [Parameter(Mandatory)]
+        [string]$UserName,
+
+        [Parameter(Mandatory)]
+        [string]$Password
+    )
+
+    $ErrorActionPreference = 'Stop'
+
+    try {
+        $connectionString = 'Server={0};Integrated Security={1};User ID={2};Password={3}' -f $ServerName,$IntegratedSecurity,$UserName,$Password
+        Write-Host -Object "Trying to connect to SQL Express instance: $ServerName"
+        $sqlConnection = New-Object System.Data.SqlClient.SqlConnection $connectionString
+        $sqlConnection.Open()
+        Write-Host -Object "Connection to SQL Express was successful."
+    } catch {
+        Write-Host -Object "Connection to SQL Express cannot be established."
+        exit 1
+    } finally {
+        ## Close the connection when we're done
+        $sqlConnection.Close()
+    }
 }
-ELSE
-{
-Write-Host "Success"
-exit 0
-}
+$instanceName = "$env:computername\SQL2019"
+Test-SqlConnection -ServerName $instanceName -IntegratedSecurity "false" -UserName "sa" -Password "P@ssword!!"