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data reader... error

Posted on 2013-10-31
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Last Modified: 2013-10-31
this code works when line 19 is removed
            string cs = "Data Source=.;Initial Catalog=Northwind;Integrated Security=True";
            SqlConnection con = new SqlConnection(cs);
            try
            {
                SqlCommand cmd1 = new SqlCommand("SELECT *  FROM Customers", con);
                con.Open();
                SqlDataReader rdr = cmd1.ExecuteReader();
                BindingSource source = new BindingSource();
                DataTable table = new DataTable();
                table.Columns.Add("CustomerID");
                table.Columns.Add("PostalCode");
                while (rdr.Read())
                {
                    DataRow  dataRow = table.NewRow();
                    string ozip = rdr["PostalCode"].ToString();
                    string nzip = ozip + "AAA";
                    dataRow["CustomerID"] = rdr["CustomerID"];
                    dataRow["PostalCode"] = ozip;
                    //dataRow["newzip"] = nzip;
                    table.Rows.Add(dataRow);
                }
                dataGridView2.DataSource = table;
            }
            catch
            {

            }

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Question by:Mike Eghtebas
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4 Comments
 
LVL 75

Expert Comment

by:käµfm³d 👽
ID: 39613803
What is the error message? What is the type of nzip?
0
 
LVL 34

Author Comment

by:Mike Eghtebas
ID: 39613807
You are very fast, here are the questions:

Q1: What is the typical syntax for Catch block to trap all errors?
Q2: How can I modify line 19 to add this new column to the grid view?

            catch
            {

            }
            finally
            {
                con.Close();
            }

Thank you.
0
 
LVL 75

Accepted Solution

by:
käµfm³d   👽 earned 2000 total points
ID: 39613830
What is the typical syntax for Catch block to trap all errors?
Well, to catch *all* errors, you would do something like:

try
{

}
catch (Exception ex)
{
    // do something with exception
}

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But it's generally advised not to do the above. Exception is a base type, and all other exceptions inherit from it. To someone reading your code, catching the general Exception looks like you don't have any clue as to what exceptions can occur within your code, so you just threw in the general Exception as a shortcut.

How can I modify line 19 to add this new column to the grid view?

Try adding the following between lines 11 and 12:

table.Columns.Add("newzip");

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0
 
LVL 34

Author Closing Comment

by:Mike Eghtebas
ID: 39613842
Thank you.
0

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