I have problem in updating user profile through asp:TextBox.
At the time of page load , all the textboxes get loaded with correct values from the database sqlserver.
say First name=SAM {i.e SAM is shown in txtName's textfield)
and Last Name=Berton
but when i alter the content of txtName to SAMANTHA
and similary for other textboxes, and click on update profile button, Internally txtName.text="SAM" gets retained notwithstanding the changed content of txtName.text="SAMANTHA" by manually altering the content of textbox.So same value that is "SAM" gets stored into the sqlserver rather than "SAMANTHA".
protected void Page_Load(object sender, EventArgs e)
{
loadProfileData();
}
protected void loadProfileData()
{
string connStringProfileload = ConfigurationManager.ConnectionStrings["myconnString"].ConnectionString;
SqlConnection conProfLoad = new SqlConnection(connStringProfileload);
conProfLoad.Open();
string emailAddLogin = User.Identity.Name.ToString();
string strSqlProfileLoad = "SELECT * FROM [gen_profile] WHERE [email]=#email";
SqlCommand cmd = new SqlCommand(strSqlProfileLoad, conProfLoad);
cmd.Parameters.AddWithValue("#email", emailAddLogin);
SqlDataReader drProfileLoad = cmd.ExecuteReader();
while (drProfileLoad.Read())
{
txtName.Text = drProfileLoad["fname"].ToString();
txtLastName.Text=drProfileLoad["lname"].ToString();
}
drProfileLoad.Close();
conProfLoad.Close();
}
protected void BtnUpdtProf_Click(object sender, EventArgs e)
{
string connStringProfileUpdate = ConfigurationManager.ConnectionStrings["myconnString"].ConnectionString;
SqlConnection conUpdateProf = new SqlConnection(connStringProfileUpdate);
conUpdateProf.Open();
string emailAddLogin = User.Identity.Name.ToString();
string strSqlUpdateProf = "UPDATE gen_profile SET fname =#fname, lname =#lname where email=#email;";
SqlCommand cmdUpdate = new SqlCommand(strSqlUpdateProf, conUpdateProf);
cmdUpdate.Parameters.AddWithValue("#fname", txtName.Text.ToUpper().Trim());
cmdUpdate.Parameters.AddWithValue("#lname", txtLastName.Text.ToUpper().Trim());
cmdUpdate.Parameters.AddWithValue("#email", emailAddLogin);
int i = cmdUpdate.ExecuteNonQuery();
conUpdateProf.Close();
if (i == 1)
Response.Redirect("~/prof/resp_update_prof.aspx");
}
Change this method :
protected void Page_Load(object sender, EventArgs e) {
loadProfileData();
}
to :
protected void Page_Load(object sender, EventArgs e) {
if (!IsPostBack) loadProfileData();
}
Basically, your textBox values are being reset in the page load event, so everytime your page posts back, it's resetting the values in the textboxes and then saving them back to the database.
This is because before your button click event, page_load get's fired which re-populates the textbox.
You can stop this happening by checking for a post back as follows:
protected void Page_Load(object sender, EventArgs e) {
if (!IsPostBack)
{
loadProfileData();
}
}
Related
I have this webform:
public class web1{
private string target = string.Empty;
protected void Page_Load(object sender, EventsArgs e){
target = "something";
}
protected void btnSubmit_Click(object sender, EventArgs e){
//use target variable here
}
}
When I click the button which triggers btnSubmit_Click() the target variable gets reset to string.Empty because of private string target = string.Empty.
Currently I'm assigning the new value to a Session and clearing it after the button click, but was wondering if there was a way of avoiding Session.
This typcial would work:
private string target = string.Empty;
protected void Page_Load(object sender, EventsArgs e){
if (!IsPostBack)
{
target = "something";
ViewState["target"] = target;
}
else
target = (string)ViewState["target"];
}
Now any button click, event code, or whatever is free to use target.
I have my website running on dotnetnuke 7.4, i have a checklistbox which i bind on the page load, and after selecting items from it, user clicks on the submit button, the selected items should save in database, however when i click on the submit button, checklistbox gets blank, i tried to enable ViewState at :
Web.config level
Page Level
Control Level
But all in vain, it still unbinds checklistbox because of which everything disappears, i tried the same in plain .net and it works like a charm.
Is there any specific settings in dotnetnuke to support viewstate, or is there any other better option to achieve this.
Here's my code:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Entities objEntities = new Entities();
List<Entities> obj = objEntities.GetList(2);
chkBox.DataSource = obj;
chkBox.DataTextField = "Name";
chkBox.DataValueField = "ID";
chkBox.DataBind();
}
}
protected void btnSubmit_Click(object sender, EventArgs e)
{
foreach (ListItem item in chkBox.Items)
Response.Write(item.Text + "<br />");
}
There's the issue. Remove that (!IsPostBack) check in your page_load event. Have your code to be like below. Else, only at first page load you are binding the datasource to control which gets lost in postback.
protected void Page_Load(object sender, EventArgs e)
{
Entities objEntities = new Entities();
List<Entities> obj = objEntities.GetList(2);
chkBox.DataSource = obj;
chkBox.DataTextField = "Name";
chkBox.DataValueField = "ID";
chkBox.DataBind();
}
OR, to be more efficient; refactor your code to a method like below and store the data object in Session variable like
private void GetDataSource()
{
List<Entities> obj = null;
if(Session["data"] != null)
{
obj = Session["data"] as List<Entities>;
}
else
{
Entities objEntities = new Entities();
obj = objEntities.GetList(2);
}
chkBox.DataSource = obj;
chkBox.DataTextField = "Name";
chkBox.DataValueField = "ID";
chkBox.DataBind();
Session["data"] = obj;
}
Call the method in your Page_Load event like
protected void Page_Load(object sender, EventArgs e)
{
GetDataSource();
}
I have database with images in folder on my server. To display this images I'am using DataList control. ItemTemplate include also a LinkButton
<asp:LinkButton ID="wybierzZdjecieBtn" OnClick="choosePhotoButton_Click" CommandArgument='<%#Eval("PhotoLinkAddress")%>' CssClass="wybierzZdjecieButton" runat="server">Choose photo</asp:LinkButton>
To receiving Value from LinkButton CommandArgument i'am using this method:
protected void choosePhotoButton_Click(object sender, EventArgs e)
{
LinkButton button = (LinkButton)(sender);
string photoLinkAddressVar = button.CommandArgument.ToString();
Response.Write(PhotoLinkAddressVar);
}
This works fine, no problems. But this is not what I want achieve. My intentions is send this variable "PhotoLinkAddressVar" to this method:
protected void addNewNews_Click(object sender, EventArgs e)
{
string trescStatus = "czeka";
string autor = Session["userName"].ToString();
DateTime data = DateTime.Now;
string dataFormat = "";
dataFormat = data.ToString("dd/MM/yyyy H:mm");
string CS = ConfigurationManager.ConnectionStrings["wiadomosciConnection"].ConnectionString;
using (SqlConnection con = new SqlConnection(CS))
{
con.Open();
string dodaj = "Insert into News (TytulNews, TrescNews, Autor, Data, Kategoria, Dotyczy, PhotoLinkAddress, Status) values (#TytulNews, #TrescNews, #Autor, #Data, #Kategoria, #Dotyczy, #PhotoLinkAddress, #Status)";
SqlCommand com = new SqlCommand(dodaj, con);
com.Parameters.AddWithValue("#TytulNews", tytulNewsTextBox.Text);
com.Parameters.AddWithValue("#TrescNews", trescTextBox.Text);
com.Parameters.AddWithValue("#Autor", autor);
com.Parameters.AddWithValue("#Data", dataFormat);
com.Parameters.AddWithValue("#Kategoria", kategoria.SelectedValue.ToString());
com.Parameters.AddWithValue("#Dotyczy", dotyczy.SelectedValue.ToString());
com.Parameters.AddWithValue("#PhotoLinkAddress", photoLinkAddressVar);
com.Parameters.AddWithValue("#Status", trescStatus);
com.ExecuteNonQuery();
}
}
User have to choose photo before press "Add News", because if He doesn't do that, he will receive error message. I dont know, how do that. I Was trying declare some kind public variable before PageLoad and do something like this:
protected void choosePhotoButtonButton_Click(object sender, EventArgs e)
{
LinkButton button = (LinkButton)(sender);
photoLinkAddressVar = button.CommandArgument.ToString();
}
but that method won't declare the variable. Do You have any idea, how can I achieve that ?.
You could use also the ViewState.
protected void choosePhotoButton_Click(object sender, EventArgs e)
{
LinkButton button = (LinkButton)(sender);
string photoLinkAddressVar = button.CommandArgument.ToString();
View["photoLinkAddressVar"]=photoLinkAddressVar;
Response.Write(PhotoLinkAddressVar);
}
Then in the addNewNews_Click method, you coukld retrieve this value with the following way:
com.Parameters.AddWithValue("#PhotoLinkAddress", ViewState["photoLinkAddressVar"]);
For further documantation about ViewState please look here.
I have a search textbox and a search button, when clicked displays a grid with the following names and gender.However I have redirected the page to another page on edit.Now When I comeback from that page to the page containing the gridview I want to display the same search again. I have successfully put retrieved the information but storing it into session, but I'm not able to call my btn_click event # page_Load.
Here's a snippet:
EDIT: I have made some changes in my code
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Redirected"] != null)
{
if (Session["FirstName"] != null)
txtSearch.Text = Session["FirstName"].ToString();
if (Session["Gender"] != null)
ddlGen.SelectedValue = Session["Gender"].ToString();
btnSearch_Click(sender, e);
}
if (!Page.IsPostBack)
{
BindGrid();
}
}
and here's the click event:
protected void btnSearch_Click(object sender, EventArgs e)
{
string query = "Select EmployeeId,FirstName,Password,Address,sex,Deptno,act_book,actTV,DOJ,isActiveYN from employees where 1=1";
if (txtSearch.Text != "")
{
query += " and FirstName like '%" + txtSearch.Text + "%'";
Session["FirstName"] = txtSearch.Text;
}
if (ddlGen.SelectedValue != "")
{
query += " and sex='" + ddlGen.SelectedValue.ToUpper() + "'";
Session["Gender"] = ddlGen.SelectedValue;
}
DataSet ds = new DataSet("Employees");
SqlConnection con = new SqlConnection("Password=admin;User ID=admin;Initial Catalog=asptest;Data Source=dbsvr");
SqlDataAdapter da = new SqlDataAdapter(query, con);
da.Fill(ds);
gvSession.DataSource = ds;
gvSession.DataBind();
}
Now I'm able to save search, so that problem is resolved ,but another has poped up that when I click the button search after changin text it takes me back to the older search..The reason is probably because sessions are not cleared,but I did that as well by handling textchanged and selectedindexchanged eventd.
Rather than trying to call your button click handler from the Page_Load, change your button click handler to simply call another method like:
protected void btnSearch_Click(object sender, EventArgs e)
{
RunSearch();
}
Then move all your btnSearch_Click() code into RunSearch()
Then in your Page_Load you can do something like:
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Gender"] != null && Session["FirstName"] != null)
{
txtSearch.Text = Session["FirstName"].ToString();
ddlGen.SelectedValue = Session["Gender"].ToString();
RunSearch();
}
if (!Page.IsPostBack)
{
BindGrid();
}
}
On a side note, I would recommend taking a look into SQLCommand Parameters. Your code is prone to SQL Injection Attacks:
http://en.wikipedia.org/wiki/SQL_injection
You should reset the session redirected variable so it doesn't fall in the same case.
protected void Page_Load(object sender, EventArgs e)
{
if (Session["Redirected"] != null)
{
Session["Redirected"] = null;
....
You can do using an QueryString paremeter when page return back to main page then here you can check QueryString paremeter is exist. here you can implement code for bind grid
if (Request.QueryString["Back"]!= null)
{
// Your bind grid function
}
You can create a function, which will called both from the button_click and page_load.
I am using c# with asp.net and SQL Server 2005 as backend. I want to use dropdown list control in a form to populate a textbox. The dropdown control is linked to a column in the database. How can I code this in c#?
Do you mean this
protected void Page_Load(object sender, EventArgs e)
{
DropDownList1.datasource = list;
DropDownList1.datBind();
}
protected void DropDownList1_OnSelectedIndexChanged(object sender, EventArgs e)
{
TextBox1.Text = DropDownList1.SelectedValue;
}
Or this
protected void DropDownList1_OnSelectedIndexChanged(object sender, EventArgs e)
{
TextBox t = new TextBox();
t.Text = DropDownList1.SelectedValue;
body.InnerHtml.add(t);
}