Question

Code :

Decimal kilometro = Decimal.TryParse(myRow[0].ToString(), out decimal 0);

some arguments are not valid?

Answer 1

out decimal 0 is not a valid parameter – 0 is not a valid variable name.

decimal output;
kilometro = decimal.TryParse(myRow[0].ToString(), out output);

By the way, the return value will be a bool – from the name of the variable, your code should probably be:

if(decimal.TryParse(myRow[0].ToString(), out kilometro))
{ 
  // success - can use kilometro
}

Since you want to return kilometro, you can do:

decimal kilometro = 0.0; // Not strictly required, as the default value is 0.0
decimal.TryParse(myRow[0].ToString(), out kilometro);

return kilometro;