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Help with Exceptions

Posted on 2008-06-12
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Last Modified: 2013-11-26
Hi,

I want to throw a freindly message.
What i am trying to do is that connect to a database I have done this but I want to throw a friendly error message if web page doesnt manage to connect to the database at any stage.

Is this possible and how ?

Thanks,

R8VI
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Question by:R8VI
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4 Comments
 
LVL 53

Accepted Solution

by:
Dhaest earned 2000 total points
ID: 21767822
Just use try-catch statement
try
{
'  open your connection
' performs some sql
}
catch(Exception x)
{

}

Some references
http://www.c-sharpcorner.com/UploadFile/rajeshvs/ExceptionHandlinginCSharp11282005051444AM/ExceptionHandlinginCSharp.aspx
http://msdn.microsoft.com/en-us/library/0yd65esw(VS.71).aspx
try
{
// Statement which can cause an exception.
}
catch(Type x)
{
// Statements for handling the exception
}
finally
{
//Any cleanup code
} 

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LVL 53

Expert Comment

by:Dhaest
ID: 21767830
SqlException-class

http://msdn.microsoft.com/en-us/library/system.data.sqlclient.sqlexception.aspx#Mtps_DropDownFilterText
public static void ShowSqlException(string connectionString)
{
    string queryString = "EXECUTE NonExistantStoredProcedure";
    StringBuilder errorMessages = new StringBuilder();
 
    using (SqlConnection connection = new SqlConnection(connectionString))
    {
        SqlCommand command = new SqlCommand(queryString, connection);
        try
        {
            command.Connection.Open();
            command.ExecuteNonQuery();
        }
        catch (SqlException ex)
        {
            for (int i = 0; i < ex.Errors.Count; i++)
            {
                errorMessages.Append("Index #" + i + "\n" +
                    "Message: " + ex.Errors[i].Message + "\n" +
                    "LineNumber: " + ex.Errors[i].LineNumber + "\n" +
                    "Source: " + ex.Errors[i].Source + "\n" +
                    "Procedure: " + ex.Errors[i].Procedure + "\n");
            }
            Console.WriteLine(errorMessages.ToString());
        }
    }
}

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