[WinForm] DataGridView EXCEL 직접 내보내기

 public void DataToExcel(DataGridView m_DataView)
         {
             SaveFileDialog kk = new SaveFileDialog(); 
             kk.Title = " EXECL "; 
             kk.Filter = "EXECL (*.xls) |*.xls | (*.*) |*.*"; 
             kk.FilterIndex = 1;
            if (kk.ShowDialog() == DialogResult.OK) 
            { 
                string FileName = kk.FileName + ".xls";
                if (File.Exists(FileName))
                    File.Delete(FileName);
                FileStream objFileStream; 
                StreamWriter objStreamWriter; 
                string strLine = ""; 
                objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write); 
                objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);
                for (int i = 0; i  < m_DataView.Columns.Count; i++) 
                { 
                    if (m_DataView.Columns[i].Visible == true) 
                    { 
                        strLine = strLine + m_DataView.Columns[i].HeaderText.ToString() + Convert.ToChar(9); 
                    } 
                } 
                objStreamWriter.WriteLine(strLine); 
                strLine = ""; 

                for (int i = 0; i  < m_DataView.Rows.Count; i++) 
                { 
                    if (m_DataView.Columns[0].Visible == true) 
                    { 
                        if (m_DataView.Rows[i].Cells[0].Value == null) 
                            strLine = strLine + " " + Convert.ToChar(9); 
                        else 
                            strLine = strLine + m_DataView.Rows[i].Cells[0].Value.ToString() + Convert.ToChar(9); 
                    } 
                    for (int j = 1; j  < m_DataView.Columns.Count; j++) 
                    { 
                        if (m_DataView.Columns[j].Visible == true) 
                        { 
                            if (m_DataView.Rows[i].Cells[j].Value == null) 
                                strLine = strLine + " " + Convert.ToChar(9); 
                            else 
                            { 
                                string rowstr = ""; 
                                rowstr = m_DataView.Rows[i].Cells[j].Value.ToString(); 
                                if (rowstr.IndexOf("\r
") >  0) 
                                    rowstr = rowstr.Replace("\r
", " "); 
                                if (rowstr.IndexOf("\t") >  0) 
                                    rowstr = rowstr.Replace("\t", " "); 
                                strLine = strLine + rowstr + Convert.ToChar(9); 
                            } 
                        } 
                    } 
                    objStreamWriter.WriteLine(strLine); 
                    strLine = ""; 
                } 
                objStreamWriter.Close(); 
                objFileStream.Close();
                MessageBox.Show(this," EXCEL "," ",MessageBoxButtons.OK,MessageBoxIcon.Information); 
            }
        }

public void DataToExcel(DataTable m_DataTable)
         {
             SaveFileDialog kk = new SaveFileDialog();
             kk.Title = " EXECL ";
             kk.Filter = "EXECL (*.xls) |*.xls | (*.*) |*.*";
             kk.FilterIndex = 1;
             if (kk.ShowDialog() == DialogResult.OK)
             {
                 string FileName = kk.FileName + ".xls";
                if (File.Exists(FileName))
                    File.Delete(FileName);
                FileStream objFileStream;
                StreamWriter objStreamWriter;
                string strLine = "";
                objFileStream = new FileStream(FileName, FileMode.OpenOrCreate, FileAccess.Write);
                objStreamWriter = new StreamWriter(objFileStream, System.Text.Encoding.Unicode);
                for (int i = 0; i < m_DataTable.Columns.Count; i++)
                {
                    strLine = strLine + m_DataTable.Columns[i].Caption.ToString() + Convert.ToChar(9);
                }
                objStreamWriter.WriteLine(strLine);
                strLine = "";

                for (int i = 0; i < m_DataTable.Rows.Count; i++)
                {
                    for (int j = 0; j < m_DataTable.Columns.Count; j++)
                    {
                        if (m_DataTable.Rows[i].ItemArray[j] == null)
                            strLine = strLine + " " + Convert.ToChar(9);
                        else
                        {
                            string rowstr = "";
                            rowstr = m_DataTable.Rows[i].ItemArray[j].ToString();
                            if (rowstr.IndexOf("\r
") > 0)
                                rowstr = rowstr.Replace("\r
", " ");
                            if (rowstr.IndexOf("\t") > 0)
                                rowstr = rowstr.Replace("\t", " ");
                            strLine = strLine + rowstr + Convert.ToChar(9);
                        }
                    }
                    objStreamWriter.WriteLine(strLine);
                    strLine = "";
                }
                objStreamWriter.Close();
                objFileStream.Close();
                MessageBox.Show(this, " EXCEL ", " ", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
        }