on page load i have shown data from database onto a gridview(with edit and delete option). I also have a search button on the page. when i click on search the searched data should be visible in the gridview, which is working fine. But when i click on delete link after search it does not take the searched row. The page postsback after clicking on delete. I need to check the event performed prior to event performed on gridview. How to do that?? I hope that the issue is clear.. Any help is appreciated. Thanks.
Page_Load occurs before RowCommand, are you only binding grid if(!IsPostBack) ?
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
BindGrid();
}
}
protected void SearchButton_Click(object sender, EventArgs e)
{
BindGrid(searchText.Text);
}
protected void GridView_RowCommand(object sender, GridViewRowEventArgs e)
{
switch(e.CommandName)
{
case "Delete":
DeleteRow(e.Row.CommandArgument);
break;
}
}
private void BindGrid()
{
//GridView binding business logic.
}
private void BindGrid(String searchTerm)
{
//GridView binding logic with searchTerm.
}
private void DeleteRow(String commandArg)
{
//Convert command arg to ID or whatever and delete data.
}
Related
I'm trying to set an initial selection for a DropDownList by calling: drop.SelectedIndex = 5 in Page_Load.
This works, but then if I change the selection manually and want to save the form, I'm still getting the initial selection instead of the new selection when calling drop.SelectedValue. What's wrong?
You have forgotten you check if(!IsPostback). Otherwise you will select the 6th item again on postbacks before the SelectedIndexChanged event is triggered (or a button-click event):
protected void Page_Load(Object sender, EventArgs e)
{
if(!IsPostBack) // do this only on the initial load and not on postbacks
dropDwonList1.SelectedIndex = 5;
}
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
//set up data here
}
}
if (Page.IsPostBack)
{
//do page reload logic in here
}
protected void foo(object sender, EventArgs e)
{
//get your selected value here
}
Try this code
You should be using if(!IsPostback) in the Page_Load function.
protected void Page_Load(Object sender, EventArgs e)
{
if(!IsPostBack)
{
drop.SelectedIndex = 5;
//yourcode
}
}
Through this your problem will be solved
I want to update my label content when the user submits a form but it doesn't get updated. Although I have put it in if (!IsPostBack) condition in form load It doesn't show the changes. The only solution that I came up with was defining a counter and increase it in button_click event and check it before label update in !IsPostBack condition. Which is working fine with that.
Is there any other way to update the label text?
Here is my solution:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (count > 0)
lblSuccessMsg.Text ="A Message!";
count = 0;
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
Save();
count = count + 1;
}
please update your label code outside of !IsPostBack evnt and inside a pageload.
Hard to tell but by the sounds of it you have a submit button and the onclick needs to update this label, something like this should work. I'm using viewstate but session would work here, as would a redirect to the same page with a querystring parameter. Not sure if I've understood your question correctly though.
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
if(Viewstate["updateLabel"] == "true")
{
lblYourLabel.Text = "I'm updated now!";
Viewstate["updateLabel"] = "";
}
}
}
protected void btnYourButton_Click(Object sender, Eventargs e)
{
ViewState["updateLabel"] = "true";
//Do other stuff here if you want
}
I have a form which has a single textbox that sends some data to the database upon hitting enter. Data is displayed below the textbox in a repeater control. Input data is displayed on the form immediately by binding the data to the repeater in the TextChanged event of that textbox.
In the CodeBehind, I am calling BindRepeater method twice, once on every new page load and once on the TextChanged event of the textbox.
How can this be rewritten to call the BindRepeater only once and still achieve the same effect?
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
BindRepeater();
}
}
protected void BindRepeater()
{
// data retrieval
// repeater binding
}
protected void CreateData(string newdata)
{
// data insert
}
protected void TextBox1_TextChanged(object sender, EventArgs e)
{
if (TextBox1.Text != string.Empty)
{
string _newData = TextBox1.Text.Trim();
CreateData(_newData);
BindRepeater();
}
}
Use an event that would be fired after the text changed event to do the binding in. you can now remove it from the page load event.
I have a page Product.aspx,there I have a user control ProductDisplay.ascx which has been created by drag and drop.
Now when a button is clicked in ProductDisplay.ascx,I want a logging function to be called which is in Product.aspx.
To achieve this I have used delegates
on ProductDisplay.ascx
public delegate void LogUserActivity(ProductService objService);
public event LogUserActivity ActivityLog;
on Product.aspx
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ProductDisp.ActivityLog += new User_UserControl_ProductDisplayBox.LogUserActivity(LogProduct);
}
}
Now button click event of ProductDisplay.ascx
protected void imgBtnBuyNow_Click(object sender, ImageClickEventArgs e)
{
if (ActivityLog != null)
{
ActivityLog(Product);
}
Response.Redirect("~/User/ShoppingCart.aspx");
}
My problem is that whenever i click this button ActivityLog is null.Why is it null?
My idea is that once i click this button,page posts back and its previous state is lost.
Please help me out with a reason and solution.
Secondly,I want to do away with null checking
**if (ActivityLog != null)**
{
ActivityLog(Product);
}
I saw some code which instantiates a delegate with a default value the moment it is declared,but i was not able to find it.Please help.
I have found solution to first problem
if (!IsPostBack)
{
ProductDisp.ActivityLog += new User_UserControl_ProductDisplayBox.LogUserActivity(LogProduct);
}
This was causing the issue.Move this line
ProductDisp.ActivityLog += new User_UserControl_ProductDisplayBox.LogUserActivity(LogProduct);
out of if (!IsPostBack)
i want to creat a web page that uses radiobuttons in a multiple choice quetions, but i want to do is to use a submit button to return the results to the next page with the mark sheet, so can you please help me with that. how to display the mark sheet on the next page using ASP.NET
Use Session state.
For example,
protected void Button1_Click(object sender, EventArgs e)
{
Session["key"] = TextBox1.Text;
Response.Redirect("marksheet.aspx");
}
Code in Page_Load of marksheet.aspx,
protected void Page_Load(object sender, EventArgs e)
{
if (Session["key"] != null)
{
object val = Session["key"];
...
}
}