if(!Page.IsPostBack)
            ...{
                DataTable dt = new DataTable();
                DataColumn dc = new DataColumn();
                dc.DataType = System.Type.GetType("System.Int32");
                dc.ColumnName = "id";
                dc.ReadOnly = true;
                dc.Unique = true;
                dt.Columns.Add(dc);

                DataSet ds = new DataSet();
                ds.Tables.Add(dt);

                for(int i=0;i<=2;i++)
                ...{
                    DataRow dr = dt.NewRow();
                    dr["id"] = i;
                    dt.Rows.Add(dr);
                }
                this.DataGrid1.DataSource = ds.Tables[0];
                this.DataGrid1.DataBind();

            }
你想要几行，在for循环中就几减1，因为是从0开始的。

下面是点提交按钮后的代码。这个提交按钮是在这个datagrid外面的哦

foreach(DataGridItem dg in this.DataGrid1.Items)
                ...{
                    HtmlInputFile hif = (HtmlInputFile)dg.FindControl("uploadfile");
                    DropDownList ddl = (DropDownList)dg.FindControl("FileFormat");
                    CheckBox cb = (CheckBox)dg.FindControl("C");
                    TextBox tb = (TextBox)dg.FindControl("Colors");
                    if(hif.PostedFile.FileName!=null)
                    ...{
                        int C = 0;
                        string filename = hif.PostedFile.FileName;
                        string filetype = hif.PostedFile.ContentType;
                        string lastfilename = filename.Substring(filename.LastIndexOf(".")+1);

                        if(filetype=="image/gif" || filetype=="image/jpg" || filetype == "image/pjpeg" || filetype =="image/bmp")
                        ...{
                            DateTime dt = DateTime.Now;
                            string Fname = dt.ToString("yyyyMMddhhmmss") + "." + lastfilename;
                            string filepath = Server.MapPath("../uploadimage") + "\" + Fname;
                            //this.File1.PostedFile.SaveAs(filepath);
                            if(cb.Checked==true)
                            ...{
                                C=1;
                            }
                            else
                            ...{
                                C=0;
                            }

                            Response.Write(Fname+"++"+ddl.SelectedItem.Text+"++"+C+"++"+tb.Text+this.TextBox1.Text+"<br>");
                        }
                        else
                        ...{
                            Response.Write("<script>alert('aaaaa');</script>");