only attempt to set UdtTypeName after checking parameter type

Tests/Tests.cs

@@ -2941,8 +2941,11 @@ class GeographyMapper : Dapper.SqlMapper.TypeHandler<DbGeography>
             public override void SetValue(IDbDataParameter parameter, DbGeography value)
             {
                 parameter.Value = value == null ? (object)DBNull.Value : (object)SqlGeography.Parse(value.AsText());
+                if(parameter is SqlParameter)
+                {
                     ((SqlParameter)parameter).UdtTypeName = "GEOGRAPHY";
                 }                
+            }
             public override DbGeography Parse(object value)
             {
                 return (value == null || value is DBNull) ? null : DbGeography.FromText(value.ToString());