time out period server is not respoinding

Server Error in '/' Application.
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Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

Source Error:


Line 243:            {
Line 244:                PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters);
Line 245:                object val = cmd.ExecuteScalar();
Line 246:                cmd.Parameters.Clear();
Line 247:                return val;