I have a asp.net page with a datalist with a textbox and a button on it, on page load the textbox gets text in it, if I change the text and press the button the text doesn't get updated.
What am I doing wrong?
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
DataTable table = CategoryAccess.GetProducts();
ProductList.DataSource = table;
ProductList.DataBind();
}
}
protected void btn_Click(object sender, EventArgs e)
{
string Name = textbox.Text;
CategoryAccess.UpdateProducts(Name);
}
}
I had same problem. I found that I put textbox.text = "xxx" in Page_Load() but outside if(!ispostback).
Try to add EnableViewState property in your textBox control and set the value to true.
e.g.
<asp:TextBox ID="textBox1"
EnableViewState="true"
MaxLength="25"
runat="server"/>
or you can do it programatically:
protected void Page_Load(object sender, EventArgs e)
{
textBox1.EnableViewState = true;
}
You need to bing again the new data...
protected void btn_Click(object sender, EventArgs e)
{
string Name = textbox.Text;
// you update with the new parametre
CategoryAccess.UpdateProducts(Name);
// you get the new data
DataTable table = CategoryAccess.GetProducts();
// and show it
ProductList.DataSource = table;
ProductList.DataBind();
}
Related
I have a Repeater which has it's data set up on Page_Load
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
myRepeater.DataSource = data;
myRepeater.DataBind();
}
}
When I come to save my data on postback, myRepeater.Items contains zero elements when I know there are several.
protected void btnSave_Click(object sender, EventArgs e)
{
....
// why does this contain zero elements>
foreach (RepeaterItem item in myRepeater.Items)
{
Any suggestions as to what may be the issue?
In this case, binding the repeater even on postback fixed the issue
protected void Page_Load(object sender, EventArgs e)
{
myRepeater.DataSource = data;
myRepeater.DataBind();
}
I want to change my button text on page load after retrieving the list view values.
For example,
<asp:Label ID="favouriteLabel" runat="server" Text='<%# Eval("favourite") %>' />
If this label value is 1, the button will change to Favourited.
I have retrieved the list view values by binding the listview
protected void ListView1_ItemDataBound(object sender, ListViewItemEventArgs e)
{
if (e.Item.ItemType == ListViewItemType.DataItem)
{
Label activity = (Label)e.Item.FindControl("favouriteLabel");
activityID = activity.Text;
}
}
then, I get the activityID and do a simple if-else check on the page load
protected void Page_Load(object sender, EventArgs e)
{
if (activityID == "1")
{
Button4.Text = "Favourited";
}
else
{
Button4.Text = "Favourite";
}
}
However it does not work. Anybody?
Do that inside a PostBack check in the load event, for instance:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (activityID == "1")
{
Button4.Text = "Favourited";
}
else
{
Button4.Text = "Favourite";
}
}
}
Read more about postback here
Page_Load happens before your ItemDataBound event so the activityId you are looking at in the Page_Load will never be 1.
Just put the code you have in the Page_Load into the ItemDataBoundEvent
I'm using an html select tag to have a list of values from my data base (column name is "DB"), in the page load - the list is populated with the right values but after the user selects a value from the list and clicks a button, when I'm trying to retrieve this value - I always get the value of the first item in the list regardless of user's selection.
aspx code:
<select id="id1" runat="server" AutoPostBack="True"></select>
<asp:Button ID="Submit" runat="server" onclick="Button1_Click" />
c# code:
protected void Page_Load(object sender, EventArgs e)
{
InstanceData = (DataSet)(Session["InstanceData"]);
id1.DataSource = InstanceData.tables[0];
id1.DataTextField = "DB";
id1.DataValueField = "DB";
id1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
string DataBase = id1.Value;
}
Below code will help you
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
InstanceData = (DataSet)(Session["InstanceData"]);
id1.DataSource = InstanceData.tables[0];
id1.DataTextField = "DB";
id1.DataValueField = "DB";
id1.DataBind();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
string DataBase = id1.SelectedValue;
}
Take the value on the SelectedIndexChanged event if you are using dropdown list.
I have a web application consisting of an aspx-file.
On page load two textboxes are filled with data (a "username" and a "password"). This works.
On a button click it should save the textboxes' text. But for some reason the text of the textboxes isn't updated if I have changed it manually meanwhile (by typing in some letters with my keyboard).
Why is that? And how can I tell my program to regard my changes?
My code is:
protected void Page_Load(object sender, EventArgs e)
{
CredentialsManager cm = new CredentialsManager();
TextBox_Benutzername.Text = cm.Username;
TextBox_Passwort.Text = cm.Password;
}
protected void Button_Speichern_Click(object sender, EventArgs e)
{
CredentialsManager cm = new CredentialsManager();
cm.setCredentials(TextBox_Benutzername.Text, TextBox_Passwort.Text);
}
EDIT:
It works with this improvement:
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
CredentialsManager cm = new CredentialsManager();
TextBox_Benutzername.Text = cm.Username;
TextBox_Passwort.Text = cm.Password;
}
}
For further information, see answers below. Thanks everyone!
Try checking for a postback -
private void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CredentialsManager cm = new CredentialsManager();
TextBox_Benutzername.Text = cm.Username;
TextBox_Passwort.Text = cm.Password;
}
}
Your Page_Load code will currently run after every button click (or postback), and overwrite the values you have manually added.
Try this,
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack){
CredentialsManager cm = new CredentialsManager();
TextBox_Benutzername.Text = cm.Username;
TextBox_Passwort.Text = cm.Password;
}
}
You are assiging the value to the textboxes on every page load instead of firt page load.
Change the Page_Load method to :
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
CredentialsManager cm = new CredentialsManager();
TextBox_Benutzername.Text = cm.Username;
TextBox_Passwort.Text = cm.Password;
}
}
I think the problem is that you are creating a new CredentialsManager each and every time that the page is loaded (I assume that a new CredentialsManager has an empty Username and Password fields). You should only do that on new page loads, and not when the page is refreshed because of a button click. That is determined with the Page.IsPostBack property, so you moght need to do:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
CredentialsManager cm = new CredentialsManager();
TextBox_Benutzername.Text = cm.Username;
TextBox_Passwort.Text = cm.Password;
}
}
Help me ..my page index is not working in visual studio.
my page load is as follows:
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
CustomerView.DataSource = Customer.GetAll();
CustomerView.DataBind();
}
}
protected void CustomerView_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgs e)
{
int newPageNumber = e.NewPageIndex + 1;
CustomerView.DataSource = Customer.GetAll();
CustomerView.DataBind();
}
what am i doing wrong my page index in not working.
Try this. I think you have to set the GridView's PageIndex property manually.
protected void CustomerView_PageIndexChanging(object sender, System.Web.UI.WebControls.GridViewPageEventArgs e)
{
CustomerView.PageIndex = e.NewPageIndex;
CustomerView.DataSource = Customer.GetAll();
CustomerView.DataBind();
}