按钮单击事件调用时，我不希望网格视图为空 [英] I don't want grid view empty when button click event call

问题描述

there is one dropdown and one button and two grid view. when i select dropdown value and than first grid will fill than i select radio button and click on apply button than second grid will be fill. problem is start now again i select drop down it will display first grid and select radio button and click on button and display only new record and old will remove so i want both

protected void btnapply_Click(object sender, EventArgs e)
   {
          SelectModel();

   }

   public void SelectModel()
   {
       if (IsPostBack)
       {
           DataTable dt = new DataTable();
           dt.Columns.AddRange(new DataColumn[6] { new DataColumn("Software"), new DataColumn("id"), new DataColumn("module"), new DataColumn("rdoread"), new DataColumn("rdoreadmodify"), new DataColumn("all") });
           foreach (GridViewRow row in Gridmodule.Rows)
           {
               if (row.RowType == DataControlRowType.DataRow)
               {
                   CheckBox chkRead = (row.Cells[0].FindControl("rdoread") as CheckBox);
                   CheckBox chkReadModify = (row.Cells[0].FindControl("rdoreadmodify") as CheckBox);
                   CheckBox chkAll = (row.Cells[0].FindControl("rdoall") as CheckBox);

                   if (chkRead.Checked)
                   {
                       string id = (row.Cells[1].FindControl("lblid") as Label).Text;
                       string module = (row.Cells[2].FindControl("lblmodule") as Label).Text;
                       bool read = true;
                       bool readmodify = false;
                       bool all = false;
                       string soft = (drpsoftware.SelectedItem.ToString());

                       dt.Rows.Add(soft, id, module, read, readmodify, all);
                   }

                   if (chkReadModify.Checked)
                   {
                       string id = (row.Cells[1].FindControl("lblid") as Label).Text;
                       string module = (row.Cells[2].FindControl("lblmodule") as Label).Text;
                       bool read = false;
                       bool readmodify = true;
                       bool all = false;
                       string soft = (drpsoftware.SelectedItem.ToString());

                       dt.Rows.Add(soft, id, module, read, readmodify, all);
                   }

                   if (chkAll.Checked)
                   {
                       string id = (row.Cells[1].FindControl("lblid") as Label).Text;
                       string module = (row.Cells[2].FindControl("lblmodule") as Label).Text;
                       bool read = false;
                       bool readmodify = false;
                       bool all = true;
                       string soft = (drpsoftware.SelectedItem.ToString());

                       dt.Rows.Add(soft, id, module, read, readmodify, all);
                   }

               }
           }
           gridselected.DataSource = dt;
           gridselected.DataBind();
       }

i希望当我第一次按下此按钮时它会填满网格，当我再次按下相同的按钮时，它永远不会删除以前的数据并填充新数据老了。



我尝试了什么：



i try viewstat但是可以没有解决问题。

i want that when i press first time this button it fill grid and when i press again the same button it never erase previous data and fill new data with old .

What I have tried:

i try viewstat but can no solve the issue.

推荐答案

参考这个简单的例子并在你的代码中实现..



< big> ASPX：

Refer this simple example and implement in your code..

ASPX:

<asp:GridView ID="Gridmodule" runat="server">
            <Columns>
                 <asp:TemplateField>
                    <ItemTemplate>
                        <asp:CheckBox  ID="chk" runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
                <asp:TemplateField>
                    <ItemTemplate>
                        <asp:TextBox Text="" ID="txtSoftware" runat="server" />
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>

        <asp:GridView ID="gridselected" runat="server">
            <Columns>
                <asp:BoundField DataField="Software" HeaderText="Software" ItemStyle-Width="50" />
            </Columns> 
        </asp:GridView> 

        <asp:Button ID="btnapply" runat="server" Text="Apply" OnClick="btnapply_Click" />

CS

CS

protected void Page_Load(object sender, EventArgs e)
     {
         if (!IsPostBack)
         {
             DataTable dt = new DataTable();
             dt.Columns.Add("SomeColumn");
             dt.Rows.Add("one");
             dt.Rows.Add("two");
             Gridmodule.DataSource = dt;
             Gridmodule.DataBind();
         }
     }
     protected void btnapply_Click(object sender, EventArgs e)
     {
         DataTable dt = new DataTable();
         dt.Columns.Add("Software");
         foreach (GridViewRow row in Gridmodule.Rows)
         {
             if (row.RowType == DataControlRowType.DataRow)
             {
                 bool isChecked = (row.FindControl("chk") as CheckBox).Checked;
                 if (isChecked)
                 {
                     string a = (row.FindControl("txtSoftware") as TextBox).Text;
                     dt.Rows.Add(a);
                 }
             }
         }

         // Adding the Second grid data to datatable
         foreach (GridViewRow row in gridselected.Rows)
             if (row.RowType == DataControlRowType.DataRow)
             {
                 string software = row.Cells[0].Text;
                 // similarly for all columns
                 dt.Rows.Add(software);
             }


         gridselected.DataSource = dt;
         gridselected.DataBind(); ;
     }

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