Checking to see server is busy

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C#

Hello everybody
I have following code to write some values to a table every one second to a remote server on shared hosting. Being on shared hosting alot of time it gives SEVER BUSY error, i was looking for a some check or loop that would check if Server was busy to re try it in 5 seconds and keep doing it until it starts writing again....any idea how to do it??? thanks

cmd = new SqlCommand("insert into DC values('" + Rate.Text + "')", con);
cmd.ExecuteNonQuery();