Understanding this code

Question

Hi,

 

I'm new to C#

 

Can someone help me understanding this bit of code?

 

for (int i = 0; i < theMaterial.Step; i++)
                    {
                        theMaterial.Data.Columns.Add(i.ToString(), typeof(double));
                    }

Is Add a C# internal function?

What is it exactly doing?

 

Sahil