int a = (int)Convert.ChangeType("1", typeof(int));

        static T ConvertTo<T>(string str)
        {
            return (T)Convert.ChangeType(str, typeof(T));
        }
        static void Main(string[] args)
        {
            int a = ConvertTo<int>("1");
            DateTime b = ConvertTo<DateTime>("01.01.2010");
        }

object sourceValue = ...

object valueToSet = null;

if(propertyInfo.PropertyType == typeof(Int16))
{
   Int16.TryParse(sourceValue, out valueToSet);
}
else if(propertyInfo.PropertyType == typeof(Int32))
{
   Int32.TryParse(sourceValue, out valueToSet);
}
...

else if(propertyInfo.PropertyType == typeof(UInt16))
{
   UInt16.TryParse(sourceValue, out valueToSet);
}
...

else if(propertyInfo.PropertyType == typeof(Double))
{
   Double.TryParse(sourceValue, out valueToSet);
}

...
propertyInfo.SetValue(obj,valueToSet);

А>object sourceValue = ...
А>object valueToSet = null;
А>if(propertyInfo.PropertyType == typeof(Int16))
А>{
А>   Int16.TryParse(sourceValue, out valueToSet);
А>}
А>

object sourceValue = ...
object valueToSet = Convert.ChangeType(sourceValue, propertyInfo.PropertyType);

public static void MapToObject(object obj, string[] strings)
{
    PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(obj);
    if(properties.Count!=strings.Length)
        throw new Exception("Bla bla bla");

    for(int i = 0; i < properties.Count; i++)
    {
        PropertyDescriptor pd = properties[i];
        if(!pd.Converter.CanConvertFrom(typeof(string)))
        {
            throw new Exception("Bla bla bla");
        }

        pd.SetValue(obj, pd.Converter.ConvertFrom(strings[i]));
    }
}



class Test
{
    public int IntValue{ get; set; }
    public decimal DecimalValue { get; set; }
    public string StrValue { get; set; }
    public DateTime DateTimeValue { get; set; }
    public Point PointValue { get; set; }

    public override string ToString()
    {
        return string.Format("IntValue: {0}, DecimalValue: {1}, StrValue: {2}, DateTimeValue: {3}, PointValue: {4}",
                             this.IntValue,
                             this.DecimalValue,
                             this.StrValue,
                             this.DateTimeValue,
                             this.PointValue);
    }
}


var obj = new Test();
Console.WriteLine(obj);
MapToObject(obj,new string[]{"4711","22","ABC","12.12.2000","5;10"});

Console.WriteLine(obj);