Empty path name is not legal Error

Empty path name is not legal Error

I'm trying to save a 2 images to my database but i keep on getting the
above error, i have tried a lot but just cant solve it.
string fileName = "";
string fileName2 = "";
private void SaveReq()
{
try
{
byte[] img = null;
byte[] img2 = null;
FileStream fs = new FileStream(fileName, FileMode.Open,
FileAccess.Read);
FileStream fs2 = new FileStream(fileName2, FileMode.Open,
FileAccess.Read);
BinaryReader br = new BinaryReader(fs);
BinaryReader br2 = new BinaryReader(fs2);
img = br.ReadBytes((int)fs.Length);
img2 = br2.ReadBytes((int)fs2.Length);
SqlConnection CN = new SqlConnection(mysql.CON.ConnectionString);
string Query = "insert into BUILD_LIC (ID,KROKY,KROKY_3AM)
values('" + txtID.Text + "',@KROKY,@KROKY_3AM)";
CN.Open();
mysql.COMMAND = new SqlCommand(Query, CN);
mysql.COMMAND.Parameters.Add(new SqlParameter("@KROKY", img));
mysql.COMMAND.Parameters.Add(new SqlParameter("@KROKY_3AM",
img2));
mysql.COMMAND.ExecuteNonQuery();
CN.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
hope to help me to solve this