在我的代码中，“无法找到可安装的ISAM”错误的原因是什么？(What could be the cause of 'Could not find installable ISAM' error in my code?)

 我无法弄清楚为什么我在这里收到错误说： Could not find installable ISAM 。 我试图将数据添加到Access文件，这似乎有问题。 
 
 我不确定为什么这不起作用，因为我在删除每个条目时使用almoust严格的代码。 
 
 这里有任何明显的错误吗？ 
 
        // Creating a query for each type of data.
        string sqlPC = @"INSERT INTO PersonalData([Type], [UserName], [Password]) 
                         VALUES(@Type, @UserName, @Password)";
        string sqlWS = @"INSERT INTO PersonalData([Type], [URL], [UserName], [Password]) 
                         VALUES(@Type, @URL, @UserName, @Password)";
        string sqlSC = @"INSERT INTO PersonalData([Type], [SoftwareName], [SerialCode]) 
                         VALUES(@Type, @SoftwareName, @SerialCode)";

    HashPhrase hashPhrase = new HashPhrase();
    Security security = new Security();

    private void InsertData(string sql)
    {
        string hashShortPass = hashPhrase.ShortHash(pass);

        string connectionString = 
            @"Provider=Microsoft.ACE.OLEDB.12.0; Data Source={0};
              Persist Security Info=False; Jet OLEDB: Database Password={1};";

        using (OleDbConnection connection = new OleDbConnection())
        {
            connection.ConnectionString = 
                string.Format(connectionString, filePath, hashShortPass);

            using (OleDbCommand command = new OleDbCommand(sql, connection))
            {
                OleDbParameter prmType = new OleDbParameter
                    ("@Type", security.EncryptAES(cmbType.Text, pass, user));

                command.Parameters.Add(prmType);

                if (cmbType.SelectedIndex == 0)
                {
                    OleDbParameter prmUserName = new OleDbParameter
                        ("@UserName", security.EncryptAES
                            (txtUserName.Text.Trim(), pass, user));
                    OleDbParameter prmPassword = new OleDbParameter
                        ("@Password", security.EncryptAES
                            (txtPassword.Text, pass, user));

                    command.Parameters.Add(prmUserName);
                    command.Parameters.Add(prmPassword);
                }
                else if (cmbType.SelectedIndex == 1)
                {
                    OleDbParameter prmURL = new OleDbParameter
                        ("@URL", security.EncryptAES
                            (txtURL.Text.Trim(), pass, user));
                    OleDbParameter prmUserName = new OleDbParameter
                        ("@UserName", security.EncryptAES
                            (txtUserName.Text.Trim(), pass, user));
                    OleDbParameter prmPassword = new OleDbParameter
                        ("@Password", security.EncryptAES
                            (txtPassword.Text, pass, user));

                    command.Parameters.Add(prmURL);
                    command.Parameters.Add(prmUserName);
                    command.Parameters.Add(prmPassword);
                }
                else if (cmbType.SelectedIndex == 2)
                {
                    OleDbParameter prmSoftwareName = new OleDbParameter
                        ("@SoftwareName", security.EncryptAES
                            (txtSoftwareName.Text.Trim(), pass, user));
                    OleDbParameter prmSerialCode = new OleDbParameter
                        ("@SerialCode", security.EncryptAES
                            (txtSerialCode.Text.Trim(), pass, user));

                    command.Parameters.Add(prmSoftwareName);
                    command.Parameters.Add(prmSerialCode);
                }

                try
                {
                    connection.Open();
                    command.ExecuteNonQuery();
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error: " + ex.Message);
                }
            }
        }
    }

I can't figure out why I am getting an error here saying: Could not find installable ISAM. I am trying to add data to Access file which seems to have a problem.
 
I'm not sure why this wouldn't work since I am using almoust exacting code when deleting each entry.
 
Is there any obvious errors here?
 
        // Creating a query for each type of data.
        string sqlPC = @"INSERT INTO PersonalData([Type], [UserName], [Password]) 
                         VALUES(@Type, @UserName, @Password)";
        string sqlWS = @"INSERT INTO PersonalData([Type], [URL], [UserName], [Password]) 
                         VALUES(@Type, @URL, @UserName, @Password)";
        string sqlSC = @"INSERT INTO PersonalData([Type], [SoftwareName], [SerialCode]) 
                         VALUES(@Type, @SoftwareName, @SerialCode)";

    HashPhrase hashPhrase = new HashPhrase();
    Security security = new Security();

    private void InsertData(string sql)
    {
        string hashShortPass = hashPhrase.ShortHash(pass);

        string connectionString = 
            @"Provider=Microsoft.ACE.OLEDB.12.0; Data Source={0};
              Persist Security Info=False; Jet OLEDB: Database Password={1};";

        using (OleDbConnection connection = new OleDbConnection())
        {
            connection.ConnectionString = 
                string.Format(connectionString, filePath, hashShortPass);

            using (OleDbCommand command = new OleDbCommand(sql, connection))
            {
                OleDbParameter prmType = new OleDbParameter
                    ("@Type", security.EncryptAES(cmbType.Text, pass, user));

                command.Parameters.Add(prmType);

                if (cmbType.SelectedIndex == 0)
                {
                    OleDbParameter prmUserName = new OleDbParameter
                        ("@UserName", security.EncryptAES
                            (txtUserName.Text.Trim(), pass, user));
                    OleDbParameter prmPassword = new OleDbParameter
                        ("@Password", security.EncryptAES
                            (txtPassword.Text, pass, user));

                    command.Parameters.Add(prmUserName);
                    command.Parameters.Add(prmPassword);
                }
                else if (cmbType.SelectedIndex == 1)
                {
                    OleDbParameter prmURL = new OleDbParameter
                        ("@URL", security.EncryptAES
                            (txtURL.Text.Trim(), pass, user));
                    OleDbParameter prmUserName = new OleDbParameter
                        ("@UserName", security.EncryptAES
                            (txtUserName.Text.Trim(), pass, user));
                    OleDbParameter prmPassword = new OleDbParameter
                        ("@Password", security.EncryptAES
                            (txtPassword.Text, pass, user));

                    command.Parameters.Add(prmURL);
                    command.Parameters.Add(prmUserName);
                    command.Parameters.Add(prmPassword);
                }
                else if (cmbType.SelectedIndex == 2)
                {
                    OleDbParameter prmSoftwareName = new OleDbParameter
                        ("@SoftwareName", security.EncryptAES
                            (txtSoftwareName.Text.Trim(), pass, user));
                    OleDbParameter prmSerialCode = new OleDbParameter
                        ("@SerialCode", security.EncryptAES
                            (txtSerialCode.Text.Trim(), pass, user));

                    command.Parameters.Add(prmSoftwareName);
                    command.Parameters.Add(prmSerialCode);
                }

                try
                {
                    connection.Open();
                    command.ExecuteNonQuery();
                }
                catch (Exception ex)
                {
                    MessageBox.Show("Error: " + ex.Message);
                }
            }
        }
    }