Fatal error occurred remote mysql C# winforms

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C#3.5

I face an error in my .net application VS2008 with C# Winform. My database Remote Mysql-Cpanel. First time if i connected there s no issue. after connected few minutes laster Fatal error encountered during command execution error occur.if i closed form and reopen its working. After testing so much time i found noting.please help me i am out of option now.i attach the error log if any one have an ans for this type of problem please help me

if (T.ConOpen() == true)
                    {
                        Boolean EntryStatus = false;
                        using (MySqlCommand cmd1 = new MySqlCommand("select * from logindetails", con))
                        {
                            using (MySqlDataReader dr1 = cmd1.ExecuteReader()) // Error Occured Here
                            {
                                while (dr1.Read())
                                {
                                    string UserNameTest = T.DecryptDetails(dr1[2].ToString());
                                    string PasswordTest = T.DecryptDetails(dr1[3].ToString());

                                    if ((String.Equals(UserNameTest, UserNameText.Text)) && String.Equals(PasswordTest, PasswordText.Text))
                                    {
                                        ValidationT_MSACCESS.LoginStatus = true;
                                        ValidationT_MSACCESS.Type = T.DecryptDetails(dr1[4].ToString());
                                        ValidationT_MSACCESS.UserNameDetails = T.DecryptDetails(dr1[1].ToString());

                                        EntryStatus = true;

                                        MessageBox.Show("Successfully Login!", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
                                        this.Close();
                                        break;
                                    }
                                }
                            }
                        }

Error:

"Fatal error encountered during command execution."

Error code :-2147467259


this is my connection string:

server=xxxx; database=xxxxx_testing; uid=xxxxx_test; pwd=*****;convert zero datetime=True;charset=utf8

please anyone tel me the solution for this problem as soon as possible

What I have tried:

i tried set net_write_timeout=99999
and connection pooling=false