从Excel文件只有1列被添加到我的MySQLDB

我试图从Excel文件插入数据到MySQL数据库。 它的工作原理，但问题是，它只插入1列。 我需要插入我的Excel文件中的所有列

这是我的代码

protected void add_Click(object sender, EventArgs e) { if (importfile.HasFile) { string path = string.Concat((Server.MapPath("~/temp/" + importfile.FileName))); importfile.PostedFile.SaveAs(path); OleDbConnection oleConn = new OleDbConnection(@"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + path + ";Extended Properties=Excel 8.0;"); OleDbCommand oleCmd = new OleDbCommand("SELECT * FROM [Sheet1$]", oleConn); OleDbDataAdapter oleAdapter = new OleDbDataAdapter(oleCmd); DataSet ds = new DataSet(); oleAdapter.Fill(ds); DataTable Dt = new DataTable(); Dt = ds.Tables[0]; string userId = (string)(Session["id"]); string groupName = groupname.Text.ToString(); try { for (int i = 0; i < Dt.Rows.Count; i++) { DataRow row = Dt.Rows[i]; int columnCount = Dt.Columns.Count; string[] columns = new string[columnCount]; for (int j = 0; j < columnCount; j++) { columns[j] = row[j].ToString(); } conn.Open(); string sql = "INSERT INTO contacts(user_id, idNum, contact_name, contact_number, group_name)"; sql += "VALUES('" + userId + "','" + columns[0] + "','" + columns[1] + "','" + columns[2] + "','" + groupName + "')"; MySqlCommand cmd = new MySqlCommand(sql, conn); int x = cmd.ExecuteNonQuery(); if (x > 0) { string message = "Success!"; System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append("<script type = 'text/javascript'>"); sb.Append("window.onload = function(){"); sb.Append("alert('"); sb.Append(message); sb.Append("')};"); sb.Append("</script>"); ClientScript.RegisterStartupScript(this.GetType(), "alert", sb.ToString()); Response.Redirect("viewgroups.aspx"); conn.Close(); } } } catch (Exception) { string message = "Failed!"; System.Text.StringBuilder sb = new System.Text.StringBuilder(); sb.Append("<script type = 'text/javascript'>"); sb.Append("window.onload = function(){"); sb.Append("alert('"); sb.Append(message); sb.Append("')};"); sb.Append("</script>"); ClientScript.RegisterStartupScript(this.GetType(), "alert", sb.ToString()); } 

这很困难。 请帮忙。 谢谢