Error trying to save image in SQL Server

I created the code to upload the image to SQL Server.

Here is the code to convert the image to bytes:

//Use FileInfo object to get file size.
FileInfo fInfo = new FileInfo(p);         

//Open FileStream to read file
FileStream fStream = new FileStream(p, FileMode.Open, FileAccess.Read);
byte[] numBytes = new byte[fStream.Length];
fStream.Read(numBytes, 0, Convert.ToInt32(fStream.Length));

//Use BinaryReader to read file stream into byte array.

//BinaryReader br = new BinaryReader(fStream);

//When you use BinaryReader, you need to supply number of bytes to read from file.
//In this case we want to read entire file. So supplying total number of bytes.

// data = br.ReadBytes((int)numBytes);
return numBytes;

And here is the code to add bytes to the parameter SqlCommandas values:

 objCmd.Parameters.Add("@bill_Image", SqlDbType.Binary).Value = imageData;
  objCmd.ExecuteNonQuery();

But I get an error

String or binary data will be truncated. Statement completed

How can I solve this problem?