Error in Data grid view cell in C#

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C#

Hi All
I am working on C# windows application where I have to put string array value to data grid view here value is coming but not adding to data grid view cell after run the program the data grid view cell is showing row index = -1 and column index = -1 below
I am giving code

private void Form1_Load(object sender, EventArgs e)
        {
            dgvDisp();
        }
private void dgvDisp()
        {
            DataGridViewTextBoxColumn dgvCol = new DataGridViewTextBoxColumn();
            dgvCol = new DataGridViewTextBoxColumn();
            dgvCol.Width = 65;
            dgvCol.ReadOnly = true;
            dgvCol.SortMode = DataGridViewColumnSortMode.Programmatic;
            dgvCol.HeaderText = "Type";
            dgvBilling.Columns.Add(dgvCol);
        }

                DataGridViewRow r1 = new DataGridViewRow();
                DataGridViewTextBoxCell c1 = new DataGridViewTextBoxCell();
                c1 = new DataGridViewTextBoxCell();
                c1.Value = stringSplitResult[0].ToString();
                r1.Cells.Add(c1);
                dataGridView1.Rows.Add(c1);