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wanted to connect the SQL database to C# using visual studio . When executed i'm getting an error

String source = "has the connection string "
SqlConnection con = new SqlConnection(source);

What I have tried:

tried all possible operations altering the source string
Updated 18-May-18 3:22am
CHill60 18-May-18 8:01am
Can you confirm that the error is on
SqlConnection con = new SqlConnection(source);
or is it on some other line that you have not shared with us
CHill60 18-May-18 8:17am
Also can you remove any logon or password information from source and share it with us.
Richard MacCutchan 18-May-18 8:58am
"tried all possible operations altering the source string"
Did you try one that is actually a valid source? Because what you show above is just rubbish as far as SQL is concerned.

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Solution 1

For starters, you need to look at the exception itself - "Argument exception was unhandled" isn't the error, it's telling you that an error occurred and you didn't handle it.
So put a try ... catch block round the code, and use the debugger to look at exactly what the error is, including any InnerException data.

It's also worth double checking your code: that line doesn't normally throw any exceptions, it doesn't check the connection string until you Open the actual connection.

It's worth checking your connection string though - this may help: Simple SQL Connection String Creation[^]

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