Prob with paging
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In my asp.net project i use arraylist to add data to my datagrid.first i add my text box values to arraylist and then i set my arraylist to datagrid as a datasource.my code worked when i disable the paging of the datagrid. But when i enable the paging it gives error. Do I need to convert my array list into a dataset or dataview. Can any one provide me better solution? Thanks
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In my asp.net project i use arraylist to add data to my datagrid.first i add my text box values to arraylist and then i set my arraylist to datagrid as a datasource.my code worked when i disable the paging of the datagrid. But when i enable the paging it gives error. Do I need to convert my array list into a dataset or dataview. Can any one provide me better solution? Thanks
You basically can use ArrayList as a datasource of the DataGrid control. You can take a quick look at the BaseDataList.DataSource property[^] to see which object can be used as a datasource for the control. Could you be more specific about your error? And could you post a snippet of your sample code? Then we can try to help you figure out your problem here.
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You basically can use ArrayList as a datasource of the DataGrid control. You can take a quick look at the BaseDataList.DataSource property[^] to see which object can be used as a datasource for the control. Could you be more specific about your error? And could you post a snippet of your sample code? Then we can try to help you figure out your problem here.
Dear Mr.Minhpc thanks for the reply.any way this is the code which i use to add data to my grid. private void btnTaskAdd_Click(object sender, System.EventArgs e) { EPGTask = new EPGProjectTask(); EPGTask.EPGTProjID = txtProjID.Text.ToUpper(); EPGTask.EPGTPhaseID = txtPhaseID.Text.ToUpper(); EPGTask.EPGTPhaseName = txtPhaseDesc.Text.ToUpper(); EPGTask.EPGTTaskID = txtTaskID.Text.ToUpper(); EPGTask.EPGTDesc = txtTaskDesc.Text.ToUpper(); lstTask.Add(EPGTask); bindTaskDetails(); } private void bindTaskDetails() { foreach(DataGridItem item in DGTask.Items) { EPGTask = new EPGProjectTask(); //read the item template if(!item.ItemType.ToString().Equals("EditItem")) { EPGTask.EPGTProjID = ((Label)item.Cells[1].FindControl("lbl1")).Text; EPGTask.EPGTPhaseID= ((Label)item.Cells[2].FindControl("lbl2")).Text; EPGTask.EPGTPhaseName= ((Label)item.Cells[3].FindControl("lbl3")).Text; EPGTask.EPGTTaskID= ((Label)item.Cells[4].FindControl("lbl4")).Text; EPGTask.EPGTDesc= ((Label)item.Cells[5].FindControl("lbl5")).Text; } //read the edit item template else if(item.ItemType.ToString().Equals("EditItem")) { EPGTask.EPGTProjID= ((TextBox)item.Cells[1].FindControl("txt1")).Text; EPGTask.EPGTPhaseID= ((TextBox)item.Cells[2].FindControl("txt2")).Text; EPGTask.EPGTPhaseName = ((TextBox)item.Cells[3].FindControl("txt3")).Text; EPGTask.EPGTTaskID = ((TextBox)item.Cells[4].FindControl("txt4")).Text; EPGTask.EPGTDesc = ((TextBox)item.Cells[5].FindControl("txt5")).Text; } lstTask.Add(EPGTask); } DGTask.DataSource = lstTask; DGTask.DataBind(); } private void DGTask_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e) { DGTask.CurrentPageIndex = e.NewPageIndex; }
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Dear Mr.Minhpc thanks for the reply.any way this is the code which i use to add data to my grid. private void btnTaskAdd_Click(object sender, System.EventArgs e) { EPGTask = new EPGProjectTask(); EPGTask.EPGTProjID = txtProjID.Text.ToUpper(); EPGTask.EPGTPhaseID = txtPhaseID.Text.ToUpper(); EPGTask.EPGTPhaseName = txtPhaseDesc.Text.ToUpper(); EPGTask.EPGTTaskID = txtTaskID.Text.ToUpper(); EPGTask.EPGTDesc = txtTaskDesc.Text.ToUpper(); lstTask.Add(EPGTask); bindTaskDetails(); } private void bindTaskDetails() { foreach(DataGridItem item in DGTask.Items) { EPGTask = new EPGProjectTask(); //read the item template if(!item.ItemType.ToString().Equals("EditItem")) { EPGTask.EPGTProjID = ((Label)item.Cells[1].FindControl("lbl1")).Text; EPGTask.EPGTPhaseID= ((Label)item.Cells[2].FindControl("lbl2")).Text; EPGTask.EPGTPhaseName= ((Label)item.Cells[3].FindControl("lbl3")).Text; EPGTask.EPGTTaskID= ((Label)item.Cells[4].FindControl("lbl4")).Text; EPGTask.EPGTDesc= ((Label)item.Cells[5].FindControl("lbl5")).Text; } //read the edit item template else if(item.ItemType.ToString().Equals("EditItem")) { EPGTask.EPGTProjID= ((TextBox)item.Cells[1].FindControl("txt1")).Text; EPGTask.EPGTPhaseID= ((TextBox)item.Cells[2].FindControl("txt2")).Text; EPGTask.EPGTPhaseName = ((TextBox)item.Cells[3].FindControl("txt3")).Text; EPGTask.EPGTTaskID = ((TextBox)item.Cells[4].FindControl("txt4")).Text; EPGTask.EPGTDesc = ((TextBox)item.Cells[5].FindControl("txt5")).Text; } lstTask.Add(EPGTask); } DGTask.DataSource = lstTask; DGTask.DataBind(); } private void DGTask_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e) { DGTask.CurrentPageIndex = e.NewPageIndex; }
There are a couple of things come to mind: + You basically need to do two things in the event handler of the
PageIndexChangedevent of the DataGrid control:private void DGTask_PageIndexChanged(object source, DataGridPageChangedEventArgs e)
{
//You first set the CurrentPageIndex property to the selected index.
DGTask.CurrentPageIndex = e.NewPageIndex;//Then rebind the datasource to the DataGrid control to refresh the control. DGTask.DataSource = lstTask; DGTask.DataBind();}
For more information, see DataGrid.PageIndexChanged Event [^] + The way you populate the
lstTaskinstance in thebindTaskDetailsmethod looks strange to me, why not just save thelstTaskobject inSessionthen you can use it later when you want to get/add items of the arraylist. -
There are a couple of things come to mind: + You basically need to do two things in the event handler of the
PageIndexChangedevent of the DataGrid control:private void DGTask_PageIndexChanged(object source, DataGridPageChangedEventArgs e)
{
//You first set the CurrentPageIndex property to the selected index.
DGTask.CurrentPageIndex = e.NewPageIndex;//Then rebind the datasource to the DataGrid control to refresh the control. DGTask.DataSource = lstTask; DGTask.DataBind();}
For more information, see DataGrid.PageIndexChanged Event [^] + The way you populate the
lstTaskinstance in thebindTaskDetailsmethod looks strange to me, why not just save thelstTaskobject inSessionthen you can use it later when you want to get/add items of the arraylist.Dear Mr.Minhpc thanks for the solution.but still i have same problem.i have added my arraylist to a session. This is the code which is in my bind method.... lstTask.Add(EPGTask); Session["TaskList"] = lstTask; ArrayList dd = new ArrayList(); dd = (ArrayList)Session["TaskList"]; DGTask.DataSource= dd; DGTask.DataBind(); this is in the pageindexpagechange..... DGTask.CurrentPageIndex = e.NewPageIndex; ArrayList dd = new ArrayList(); dd = (ArrayList)Session["TaskList"]; DGTask.DataSource= dd; DGTask.DataBind(); but when i add elements to grid,every time it shows only 1 element in the second page.and also i go to second page of my grid and try to add element then it gives error called ... Invalid CurrentPageIndex value. It must be >= 0 and < the PageCount Please provide me better solution.
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Dear Mr.Minhpc thanks for the solution.but still i have same problem.i have added my arraylist to a session. This is the code which is in my bind method.... lstTask.Add(EPGTask); Session["TaskList"] = lstTask; ArrayList dd = new ArrayList(); dd = (ArrayList)Session["TaskList"]; DGTask.DataSource= dd; DGTask.DataBind(); this is in the pageindexpagechange..... DGTask.CurrentPageIndex = e.NewPageIndex; ArrayList dd = new ArrayList(); dd = (ArrayList)Session["TaskList"]; DGTask.DataSource= dd; DGTask.DataBind(); but when i add elements to grid,every time it shows only 1 element in the second page.and also i go to second page of my grid and try to add element then it gives error called ... Invalid CurrentPageIndex value. It must be >= 0 and < the PageCount Please provide me better solution.
Can you run your application in debug mode and try to see the values of the
CurrentPageIndexandPageCountproperties before the error happens? I doubt that those values are not inline with your datasource (the arraylist instance). If you just use a single web page for both listing all items and adding a new item, then you'll have to rebind the datasource to the datagrid so that it can reflect the updated datasource.