What is the objective and difference of mysql beginexecutenonquery and executenonquery

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MySQL

Can somebody elaborate for me to the below MySQL commands under the

BeginExecuteNonQuery()

and

ExecuteNonQuery()

1. why we use this for execute the query?
2. What is the difference of both either using one?
3. is there any performance optimizing issues?

What I have tried:

 Con.Open();
string q3 = "DELETE FROM producttbl WHERE productid='" + this.textBox1.Text + "';";
MySqlCommand cmd = new MySqlCommand(q3, Con);
cmd.ExecuteNonQuery(); // cant we use cmd.BeginExecuteNonQuery();
                    MessageBox.Show("Product Deleted");
                    Con.Close();