Integration Services :: Convert Field Of VARCHAR To INT Datatype In SSIS 2014?

I'm trying to convert a column in my source table of datatype varchar(6) to a column of datatype int in my destination. I tried using the Derived Column/Data Conversion transformations but none of them worked. So, I tried using the following C# (credits to the original poster) and getting an error during compilation.

Note: "MyCol" is the Input Column I've specified in the Script Component and "CleanCol" is the Output column I've specified as datatype [DT_I4].

public override void Input0_ProcessInputRow(Input0Buffer Row)
{
int colOut = 0;
if (!Int32.TryParse(Row.MyCol, out colOut))
{
Row.CleanCol_IsNull = true;
} else {
Row.CleanCol = colOut;
}
}

The best overloaded method match for 'int.TryParse(string, out int)' has some invalid arguments

The other expression I've tried was:

ISNULL(MyCol) ? (dt_i4)"" : (dt_i4)MyCol

From the above code, you might have understood that the source field has some blank records as well in the MyCol field.

What is the best possible way to do the conversion from a String to Int or fixing the error from the above.