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How to implement exception handling in a 3 tier web app

Posted on 2011-02-10
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Last Modified: 2012-05-11
Hi,

I am new to the 3 tier development architecture and am looking to see what is the most common and efficient way to create error handling. Is it by creating a custom error handling object? Any help is much appreciated!
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Question by:bschave2
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Anil Golamari earned 500 total points
ID: 34865532
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Expert Comment

by:Carl Tawn
ID: 34865607
It depends entirely on what you need to do and what you need to report to the upper tiers. Trapping exceptions where they happen is usually best, and you will of course want to log them. You can then either re-throw the exception to, for example, let your UI know something went wrong. But whether you rethrow the original exception, or a more generic custom exception type is up to you.
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Author Comment

by:bschave2
ID: 34866854
How can I pass the exception back to the UIl?

well say in the UIL I call an object in the UIL

BLL customers = new BLL();
customers.GetCustomers(gvCustomers);

in the BLL method I get the gridview:

public void GetCustomers(GridView gvCustomers)
    {

        DLL getGV = new DLL();
        gvCustomers.DataSource = getGV.getDS("getCusts");
        gvCustomers.DataBind();
    }

And in the DLL i have the method as

public DataSet getDS(string ProcName, SortedList<string, string> sqlParams)
    {
        try
        {
            getCon();
            cmd = new SqlCommand(ProcName, con);

            //Looping through params.
            foreach (KeyValuePair<string, string> Param in sqlParams)
            {
                cmd.Parameters.AddWithValue(Param.Key.ToString(), Param.Value.ToString());

            }
            da = new SqlDataAdapter(cmd);
            cmd.CommandType = CommandType.StoredProcedure;
            ds = new DataSet();
            da.Fill(ds);

            closeCon();
        }
        catch (SqlException sqlex)
        {
            throw new Exception(ex.message);
        }

        return ds;
    }
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