If I Want To Create Acyclic Graph What Should I Do First

well i try to make a program that calculate Critical path at first i just want to calculate and show it in my program. and i store everything in lists like this

for (int X = 0; X <= dataGridView1.RowCount - 1; X++) // เก็บ ชื่อกิจกรรม ไว้ใน list
{

Proj_name = Convert.ToString(dataGridView1.Rows[X].Cells[0].Value);

Proj_name_Values.Add(Convert.ToString(Proj_name));
}
for (int X = 0; X <= dataGridView1.RowCount - 1; X++) // เก็บ duration ไว้ใน list
{

Duration = Convert.ToInt32(dataGridView1.Rows[X].Cells[1].Value);

Duration_Values.Add(Convert.ToInt32(Duration));
}

for (int X = 0; X <= dataGridView1.RowCount - 1; X++) // เก็บค่า predecessor ไว้ใน list
{

Predecessor = Convert.ToString(dataGridView1.Rows[X].Cells[2].Value);

String[] Word = Predecessor.Split(' ');

Predecessor_Number.Add(Convert.ToString(Word.Length));

Predecessor_Values.Add(Convert.ToString(Predecessor));

Predecessor_Value_FindLF.Add(Convert.ToString(Predecessor));
}

but now i want to use this data to make a graph with adjacency list or matrix . i don't know any thing about it so i have no clue what to do next can you please help!

i already google about it. i try to understand about adj list like 3 day but i have no clue

how to move the data in list i have to the linked list as a node