Correct syntax in an overloaded method

[paulucie]

In ClassA.cs I have this

public struct tChannel
    {
        [MarshalAsAttribute(UnmanagedType.I1)]
        public bool IsSigned;
        public byte BitSize;
        public sbyte UnitExponent;
        public uint Unit;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string UnitStr;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string ChannelName;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string UserChannelName;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string UserChannelName_NV;
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 64, ArraySubType = UnmanagedType.I1)]
        public byte[] RFU;
    }
 
public struct tOakSensor
    {
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 256)]
        public string DevicePath;
        public ushort VID;
        public ushort PID;
        public ushort REV;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string SN;
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 64, ArraySubType = UnmanagedType.I1)]
        public byte[] RFU;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string DeviceName;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string UserDeviceName;
        [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 24)]
        public string UserDeviceName_NV;
        public ushort NumChannels;
        [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 11)]
        public tChannel[] Channel; 
 
   }
 
 
 public class OakSensor
 
{
        public static extern bool Oak_FindSensor_a(ushort PID, ushort REV, string SN, string DeviceName, string ChannelName, string UserDeviceName, string UserChannelName, ref tOakSensor SensorFound);
}       
 

I need to use the Oak_FindSensor_a method in another class
So in ClassB.cs I try to use an overloaded method

private void CmdLancer_Click_1(object sender, EventArgs e)
        {
            tOakSensor sensor = new tOakSensor();
            tChannel sensora = new tChannel();
 
 
            OakSensor.Oak_FindSensor_a(sensor.PID, sensor.REV, sensor.SN, sensor.DeviceName, sensora.ChannelName, sensor.UserDeviceName, sensora.UserChannelName, ref sensor);
 
            textBox3.Text = sensor.SN;
            textBox4.Text = sensor.DeviceName;
            textBox5.Text = sensora.ChannelName;
            textBox6.Text = sensor.UserDeviceName;
            textBox7.Text = sensora.UserChannelName;
        }
 

As you see there is sensor. and sensora. in the method arguments.
The code compile well but does not return the sensora.ChannelName and the sensora.UserChannelName

I guess I have a syntax error. How can I handle that ?
Regards