How to set Border to excel when we export datagrid to excel?

Question

Hello, i simply export the datagridview into excel. now, I want to set border to data in excel.

so how can i do this, help me for the solution.

 

 this is the code of export datagridview to excel.

private void btnexport_Click(object sender, EventArgs e)
        {
            if (dataGridView1.Rows.Count > 0)
            {
                Microsoft.Office.Interop.Excel._Application XcelApp = new Microsoft.Office.Interop.Excel.Application();
                XcelApp.Application.Workbooks.Add(Type.Missing);

                for (int i = 1; i < dataGridView1.Columns.Count + 1; i++)
                {
                    XcelApp.Cells[1, i] = dataGridView1.Columns[i - 1].HeaderText;
                }

                for (int i = 0; i < dataGridView1.Rows.Count; i++)
                {
                    for (int j = 0; j < dataGridView1.Columns.Count; j++)
                    {
                        XcelApp.Cells[i + 2, j + 1] = dataGridView1.Rows[i].Cells[j].Value;
                    }
                }
                XcelApp.Columns.AutoFit();
                XcelApp.Visible = true;
            }


        }

 

 

i want the excel in this format.