binding data to datagridview combobox value

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C#

C#4.0

Hi friends

The below is my code for binding data to gridview.
This method for creating datagridview column

public void designgrid()
        {
            DataGridViewColumn firstcolumn=dataGridView1.Columns[1]; 
            DataGridViewCell cell=new DataGridViewTextBoxCell();
            firstcolumn.CellTemplate=cell;
            firstcolumn.HeaderText = "AdmissionNumber";
            firstcolumn.Width = 50;
            
            DataGridViewColumn secondcolumn = dataGridView1.Columns[2];
            DataGridViewCell cell1 = new DataGridViewTextBoxCell();
            secondcolumn.CellTemplate = cell1;
            secondcolumn.HeaderText = "StudentName";
            secondcolumn.Width = 80;

            DataGridViewColumn Thirdcolumn = dataGridView1.Columns[3];
            DataGridViewCell cell2 = new DataGridViewTextBoxCell();
            Thirdcolumn.CellTemplate = cell1;
            Thirdcolumn.HeaderText = "StanderedName";
            Thirdcolumn.Width = 80;

            DataGridViewColumn forthcolumn = dataGridView1.Columns[4];
            DataGridViewCell cell3 = new DataGridViewTextBoxCell();
            forthcolumn.CellTemplate = cell3;
            forthcolumn.HeaderText = "RegisterNumber";
            forthcolumn.Width = 50;

            DataGridViewColumn fifthcolumn = dataGridView1.Columns[5];
            fifthcolumn = new DataGridViewComboBoxColumn();
            fifthcolumn.HeaderText = "SortNo";
            fifthcolumn.Width = 50;



        }

This code for binding data to gridview

DataTable studentbind = ibl4.studentbindforfemale(sdt);
               int rowcount = studentbind.Rows.Count;
               List<string> no = ibl4.setnoofint(rowcount);
               int registerno = ibl4.getregiter(sdt);
               designgrid();
               for(int i=0;i<rowcount;i++)
               {
                   dataGridView1.Rows[i].Cells[0].Value = studentbind.Rows[i]["AdmissionNumber"].ToString();
                   dataGridView1.Rows[i].Cells[1].Value = studentbind.Rows[i]["StudentName"].ToString();
                   dataGridView1.Rows[i].Cells[2].Value = studentbind.Rows[i]["Standered_name"].ToString();
                   dataGridView1.Rows[i].Cells[3].Value = registerno;

               }

Here "Datatable studentbind" contains first 3 columns value as specified in the name in code.
fourth column is textbox column which acutally add as a extra column that want to contain the value of "Registerno" for all row.
fithcolumn i have created as a combobox column. but i dont know how can bind data to this column. the bind data is "List<string> no";
and also please help how can add data to gridviewtextboxcolumn.
still i didnt run my code. so i dont know whether is in the code. if error come please help me to solve the problem