Style & Multiple connections from 1 connString

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SQL

style

Which would be a better style in terms of handling the connections in c sharp

function A()
{
SqlConnection connString = new SqlConnection(SqlCred);
            SqlCommand cmdInsert = new SqlCommand("Query here", connString);
     try
          {
            connString.Open();
            cmdInsert.ExecuteNonQuery();
            connString.Close();
            connString.Dispose();
          }
    catch
          {}

}

function B()
{
using(SqlConnection connString = new SqlConnection(SqlCred))
     {
     using sqlcmd cmd = (//stuff//)
          {
           connString.Open();
           cmd.executenonquery();
          }
     }
}

also while I was playing around with each of these i came across the idea of having a global connString creating only one pool of connections for the functions to open and close accordingly.

namespace Program
{
    public class Program class
    {
     SqlConnection connString = new SqlConnection(SqlCred);
     functionX(connString);
     functionY(connString);
    }

}

assuming function x and y open and close only when they need to use the connString