Re: How no to direct to a page aftr logging out ? - ASP.NET Discussion Boards

Thanks For reply...
I do not want this things.. there are two tree view .i want click on treeview1 node and copy through bottom click in treeview2 at same label.

Piyush Vardhan Singh
p_vardhan14@rediffmail.com
http://holyschoolofvaranasi.blogspot.com
http://holytravelsofvaranasi.blogspot.com

USE This:
In html:

<asp:treeview id="TreeView1" runat="server" xmlns:asp="#unknown">
<nodes>
<asp:treenode showcheckbox="True" text="Node1" value="Node1">
<asp:treenode showcheckbox="True" text="Node2" value="sub Node">
<asp:treenode showcheckbox="True" text="Node3" value="Node3">

<asp:treeview id="TreeView2" runat="server" xmlns:asp="#unknown">

<asp:button id="SubmitButton" runat="server" text="Submit" xmlns:asp="#unknown">

In code behind:

For Each node As TreeNode In TreeView1.CheckedNodes
Dim treenode As New TreeNode()
treenode.Text = node.Text
Me.TreeView2.Nodes.Add(treenode)
Next

The miracle is this--the more we share, the more we have.

In my project , i've a page to b used by users who logs in successfully ,but after he logs out he shud not c the previous pages ven he clicks Back Button in the Browser?
Plz help.

After login u will get one page ,in that page try this

private void Page_Load(object sender, System.EventArgs e)
{
Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();
}

Its not working.

Hai,

It is working perfectly in 2.0 where did u paste the code?
after the login page ,u will get a page ,in that page ,inside the pageload event just paste this code

Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();

The error came like these when click on the back button.
"Use the new keyword to create an object instance.
Check to determine if the objects is null before calling the method."

try this eg:

username and password is admin

Default.aspx
]]>

<title>Untitled Page

<asp:textbox id="TextBox1" runat="server" style="z-index: 100; left: 453px; position: absolute;<br mode=" hold=" /> top: 93px" xmlns:asp="#unknown">
<asp:textbox id="TextBox2" runat="server" style="z-index: 101; left: 462px; position: absolute;<br mode=" hold=" /> top: 158px" textmode="Password" xmlns:asp="#unknown">
<asp:button id="Button1" runat="server" onclick="Button1_Click" style="z-index: 102;<br mode=" hold=" /> left: 514px; position: absolute; top: 250px" text="Button" xmlns:asp="#unknown">
<asp:label id="Label1" runat="server" style="z-index: 104; left: 323px; position: absolute;<br mode=" hold=" /> top: 97px" text="Enter the username" xmlns:asp="#unknown">
<asp:label id="Label2" runat="server" style="z-index: 104; left: 327px; position: absolute;<br mode=" hold=" /> top: 158px" text=" Enter the password" xmlns:asp="#unknown">

Default2.aspx

]]>

<title>Untitled Page

<asp:label id="Label1" runat="server" font-bold="True" font-size="XX-Large" forecolor="Red" xmlns:asp="#unknown">
Height="86px" Style="z-index: 100; left: 239px; position: absolute; top: 26px"
Text="Welcome" Width="295px">
<asp:linkbutton id="LinkButton1" runat="server" onclick="LinkButton1_Click" style="z-index: 102;<br mode=" hold=" /> left: 637px; position: absolute; top: 26px" xmlns:asp="#unknown">Logout

Default.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Focus();
}
protected void Button1_Click(object sender, EventArgs e)
{
if (TextBox1.Text == "admin" && TextBox2.Text == "admin")
{
Server.Transfer("Default2.aspx");
}
else
{
Response.Write("Wrong username or password");
}
}
}

Default2.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class Default2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
Response.Cache.SetExpires(DateTime.UtcNow.AddMinutes(-1));
Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.Cache.SetNoStore();

}
protected void LinkButton1_Click(object sender, EventArgs e)
{
Session.Abandon();
Server.Transfer("Default.aspx");
}
}

Thank u..

Is it possible to create a Frameset in Visual studio 2005? How?

Because frames are not fully supported by the w3c, it is not implemented in Asp.net 2.0. You can implement it only throw editing in the source view.
you can also create the HtmlGenericControl object that will eventually render as an iframe and specify whatever attributes this iframe will have:

// Create new iframe control
HtmlGenericControl searchFrame = new HtmlGenericControl("iframe");
searchFrame.ID = "searchFrame";
searchFrame.Attributes.Add("class", "searchFrame");
searchFrame.Attributes.Add("frameborder", "0");

Then, I can add it to the PlaceHolder’s controls collection:

// Add it to the Controls collection of the PlaceHolder control
searchHolder.Controls.Add(searchFrame);

Finally, I add the PlaceHolder control into my ascx document where I’d like the iframe to eventually be:

<div class="searchContainer">
<asp:PlaceHolder id="searchHolder" runat="server" />
</div>

Now, an iframe will appear in the outputted HTML code where the placeholder once was.

The similar type of things can be implemented ASP.NET2.0 by "Master Page"

The miracle is this--the more we share, the more we have.

which method is more appropriate for use with XML?

-> xmlDocument
-> xPathDocumrnt
-> Datatset

Depends on what you want to achieve. For navigation within an XML the best choice will be xpath I think. XmlDocument could be also nice but you only have this navigation like direct child/parents etc. DataSet is better when trying to use XML like a database.

By the way, this is not your homework, is it?

Regards
Sebastian

P.S.: Heard that XPath will is slow... maybe this will affect your choice.

It's not a bug, it's a feature!

Check out my CodeProject article Permission-by-aspect.

Me in Softwareland.

I have developed a chat application.

i am displaying chat messages using gridview in a div.I am using gridview in update panel(ajax).With every timer_tick I update the gridview.My timer control s in control template of update panel.The problem is I have to maintain the scroll position after after timer tick event ie after the grid gets the data.

I ahve altried all the options on the net.None of them is working.Help me Its urgent.
This problem is buggin me alot.

Here is the code .aspx

]]>

<title>Welcome to chat application
<%----%>

<asp:scriptmanager id="ScriptManager1" runat="server" xmlns:asp="#unknown">

<asp:updatepanel id="UpdatePanel1" runat="server" xmlns:asp="#unknown">
<contenttemplate>

<asp:gridview showheader="false" width="1%" cellpadding="0" cellspacing="0" id="gvmsg" gridlines="None" runat="Server" autogeneratecolumns="false">
<columns> <asp:templatefield>
<itemtemplate>

]]>
<%-- <asp:label id="lblchtmsg" width="230px" runat="server" text="<%#Eval(" chat_msgs")%>"=""> --%> <%#Eval("Chat_msgs")%>

<asp:timer id="Timer1" runat="server" interval="200" ontick="Timer1_Tick" enabled="True">

<%--<asp:timer id="Timer2" runat="server" ontick="Timer2_Tick" enabled="False" interval="200">

--%>

here is the .cs code

public partial class showmsg : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}
public void asUser()
{
string cnt = dbFunctions.getSingleRecord ("select count(*) from ChatMsgs where Chat_id='" + Session["chatid"].ToString()+"'");
if (int.Parse(cnt) > 10)
lbtncomplete.Visible = true;
// DataTable dt = dbFunctions.getTable("select * from ChatMsgs where Chat_id='" + Session["chatid"].ToString() + "' ORDER BY ID ASC");
DataTable dt = dbFunctions.getTable("select * from ChatMsgs where ID in(select TOP 11 ID from ChatMsgs where Chat_id='" + Session["chatid"].ToString() + "' ORDER BY ID DESC) ");
gvmsg.DataSource = dt;
gvmsg.DataBind();

}
public void asAdmin()
{
DataTable dt = dbFunctions.getTable("select * from ChatMsgs where Chat_id='" + Session["chatid"].ToString() + "'");
// DataTable dt = dbFunctions.getTable("select * from ChatMsgs ORDER BY ID DESC ");
gvmsg.DataSource = dt;
gvmsg.DataBind();

}

protected void Timer1_Tick(object sender, EventArgs e)
{

//if (Session["top10"].ToString() == "true")
//asUser();
asAdmin();

}
protected void lbtncomplete_Click(object sender, EventArgs e)
{

//Session["top10"] = "false";
DataTable dt = dbFunctions.getTable("select * from ChatMsgs where Chat_id='" + Session["chatid"].ToString() + "' ORDER BY ID ASC");
// DataTable dt = dbFunctions.getTable("select * from ChatMsgs ORDER BY ID DESC ");
gvmsg.DataSource = dt;
gvmsg.DataBind();

}
}

Please help its really urgent

Thanks in advance

Use this javascript code after the databind or just before the closing body tage.

var objDiv = document.getElementById("div1");
objDiv.scrollTop = objDiv.scrollHeight;

Use the original 'div id' in place of div1.

The miracle is this--the more we share, the more we have.

hey gaurav thanks for reply

i was waiting for a reply no body replied i guess its not such atough question

anywaz your solution is not working any other solutions.

i am fed up this problem

hopefuly some one can give a solution(s)

thanks in adavnce

oh...
It should work...Because it is tested in my porject.

For creating a scroll i used style="overflow:auto" in my div...

Try it again...

The miracle is this--the more we share, the more we have.

hey gaurav

believe me its not working i tried it ..(many times now)

my chat messages are going down i have drag the vertical scroll bar down to see the messages

the scroll position does not remain at the same position after the timer_tick in update panel fires....

waiting for your reply

Thanks in advance

also sorry to disturb u alot

u can try my code which i have given in first post

thanks in advance
tc

hi All,

I am new to dot net...

i am learning it and I am doing my masters project in c# dot net with sql server 2000 backend...

The issue i am having now is...
i am having a gridview, upon selection of one of the rows, the row data is loaded into the textbox and dropdowns, so that when changes are made and update button is hit, the data is updated in the backend...

all works fine except for the update Frown | :(

issue is with postback but i dont know how to do that... pls help... giving all the codes below...

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

public partial class scenarios : System.Web.UI.Page
{
SqlConnection con = new SqlConnection("...;");
SqlCommand cmd = new SqlCommand();
SqlDataReader dr;
SqlDataAdapter da;
common obj = new common();
string sql;
string s;

protected void Page_Load(object sender, EventArgs e)
{
Session["projid"] = "12345";
Session["projname"] = "ProjectA";
if (!IsPostBack)
{
pid.Text = Session["projid"].ToString();
pname.Text = Session["projname"].ToString();
sql = "select * from scenarios where pid = '" + Session["projid"].ToString() + "'";
da = new SqlDataAdapter(sql, con);
DataTable dt = new DataTable();
da.Fill(dt);
int prowct = dt.Rows.Count;
if (prowct == 0)
{
btnadd.Visible = true;
btnupdate.Visible = false;
GridView1.DataBind();
}
else
{
btnadd.Visible = true;
btnupdate.Visible = false;
GridView1.DataBind();
}

}

}
protected void btnadd_Click(object sender, EventArgs e)
{
con.Open();
sql = "Insert into scenarios values ('" + pid.Text + "','" + pname.Text + "','" + tbcat.Text + "','" + tbscenario.Text + "','" + ddlprob.SelectedValue.ToString() + "','" + ddlprob.SelectedItem.Text + "','" + ddlimpact.SelectedValue.ToString() + "','" + ddlimpact.SelectedItem.Text + "','" + tbmitig.Text + "')";
cmd = new SqlCommand(sql, con);
cmd.ExecuteNonQuery();
obj.msgbox("Values are inserted");
con.Close();
clearall();
GridView1.DataBind();

}

public void clearall()
{
tbcat.Text = "";
tbscenario.Text = "";
ddlprob.ClearSelection();
ddlimpact.ClearSelection();
tbmitig.Text = "";
}
protected void btnreset_Click(object sender, EventArgs e)
{
clearall();
}
protected void GridView1_SelectedIndexChanged(object sender, EventArgs e)
{
btnadd.Visible = false;
btnupdate.Visible = true;
s = GridView1.SelectedValue.ToString();
sql = "select * from scenarios where ID = '" + s + "'";
con.Open();
cmd = new SqlCommand(sql, con);
dr = cmd.ExecuteReader();
if (dr.Read())
{
tbcat.Text = dr[3].ToString();
tbscenario.Text = dr[4].ToString();
ddlprob.SelectedIndex = int.Parse(dr[5].ToString());
ddlimpact.SelectedIndex = int.Parse(dr[7].ToString());
tbmitig.Text = dr[9].ToString();
}
con.Close();

}
protected void btnupdate_Click(object sender, EventArgs e)
{
//cmd.Connection = con;
con.Open();
sql = "update scenarios set discateg = '" + tbcat.Text + "', disscenario= '" + tbscenario.Text + "', probval = '" + ddlprob.SelectedValue.ToString() + "', prob = '" + ddlprob.SelectedItem.Text + "', impactval = '" +ddlimpact.SelectedValue.ToString() + "', impact = '" + ddlimpact.SelectedItem.Text + "', mitig = '" + tbmitig.Text + "' where ID= '" +s + "'";
cmd = new SqlCommand(sql, con);
cmd.ExecuteNonQuery();
obj.msgbox("Values are updated");
con.Close();
clearall();
GridView1.DataBind();

}
}
-----------

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="scenarios.aspx.cs" Inherits="scenarios" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>Untitled Page</title>
<style type="text/css">
.style1
{
width: 100%;
}
.style2
{
text-align: right;
}
</style>
</head>
<body style="font-family: Verdana; font-size: x-small">
<form id="form1" runat="server">
<div>

<table class="style1">
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
 </td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
Project Name:</td>
<td>
<asp:Label ID="pname" runat="server"></asp:Label>
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
<br />
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
Project ID:</td>
<td>
<asp:Label ID="pid" runat="server"></asp:Label>
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
 </td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
Category:</td>
<td>
<asp:TextBox ID="tbcat" runat="server" Width="183px" Font-Names="Verdana"
Font-Size="X-Small"></asp:TextBox>
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
 </td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
Disaster Scenario:</td>
<td>
<asp:TextBox ID="tbscenario" runat="server" Height="62px" Width="183px"
Font-Names="Verdana" Font-Size="X-Small"></asp:TextBox>
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
 </td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
Probability:</td>
<td>
<asp:DropDownList ID="ddlprob" runat="server" Font-Names="Verdana"
Font-Size="X-Small">
<asp:ListItem Value="0">Select</asp:ListItem>
<asp:ListItem Value="1">Low</asp:ListItem>
<asp:ListItem Value="2">Medium</asp:ListItem>
<asp:ListItem Value="3">High</asp:ListItem>
</asp:DropDownList>
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
 </td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
Impact:</td>
<td>
<asp:DropDownList ID="ddlimpact" runat="server" Font-Names="Verdana"
Font-Size="X-Small">
<asp:ListItem Value="0">Select</asp:ListItem>
<asp:ListItem Value="1">High</asp:ListItem>
<asp:ListItem Value="2">Medium</asp:ListItem>
<asp:ListItem Value="3">Low</asp:ListItem>
</asp:DropDownList>
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
 </td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
Mitigation:</td>
<td>
<asp:TextBox ID="tbmitig" runat="server" Height="62px" Width="183px"
Font-Names="Verdana" Font-Size="X-Small"></asp:TextBox>
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
 </td>
<td>
 </td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2">
<asp:Button ID="btnupdate" runat="server" Height="20px"
onclick="btnupdate_Click" Text="Update" Width="50px" />
<asp:Button ID="btnadd" runat="server" Height="20px" Text="Add" Width="50px"
onclick="btnadd_Click" />
</td>
<td>
        &n bsp; 
<asp:Button ID="btnreset" runat="server" Height="20px" Text="Reset"
Width="50px" onclick="btnreset_Click" />
</td>
<td>
 </td>
</tr>
<tr>
<td>
 </td>
<td class="style2" colspan="2">
<br />
<asp:GridView ID="GridView1" runat="server" AllowPaging="True"
AllowSorting="True" DataKeyNames="ID" DataSourceID="SqlDataSource1"
onselectedindexchanged="GridView1_SelectedIndexCha nged"
style="text-align: left">
<Columns>
<asp:CommandField ShowSelectButton="True" />
</Columns>
</asp:GridView>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:bcpertConnectionString %>"
SelectCommand="SELECT * FROM [scenarios] WHERE ([pid] = @pid)">
<SelectParameters>
<asp:SessionParameter Name="pid" SessionField="projid" Type="String" />
</SelectParameters>
</asp:SqlDataSource>
</td>
<td>
 </td>
</tr>
</table>

</div>
</form>
</body>
</html>
------------------------

table creation code:
CREATE TABLE [dbo].[scenarios] (
[ID] [int] IDENTITY (1, 1) NOT NULL ,
[pid] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[pname] [varchar] (100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[discateg] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[disscenario] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[prob] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[impact] [varchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NULL ,
[mitig] [varchar] (300) COLLATE SQL_Latin1_General_CP1_CI_AS NULL
) ON [PRIMARY]
GO

use formview and use its edit template to updata the data.
code is below.i am suggest this is bcos its widely use in field. u can use your method for which i put the btn edit event below.

protected void GridView1_RowCommand(object sender, GridViewCommandEventArgs e)
{
if (e.CommandName == "editbtn")
{
frm_emp.ChangeMode(FormViewMode.Edit);//frm_emp is the name of formview
ViewState["id"] = e.CommandArgument.ToString();
//com.CommandText = "select * from emp_data where id like '" + e.CommandArgument.ToString() + "%'";
com = new SqlCommand();
com.CommandText = "select_record_id";//use above query
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@eid", e.CommandArgument.ToString());
com.Connection = con;
ds = new DataSet();
adp = new SqlDataAdapter(com);
adp.Fill(ds);
frm_emp.Visible = true;
frm_emp.DataSource = ds.Tables[0];
frm_emp.DataBind();

protected void btnedit_Click(object sender, EventArgs e)//event on update button.
{
try
{
con.Open();
com = new SqlCommand();
com.Connection = con;
//com.CommandText = "select * from emp_data where name=('" + ((TextBox)frm_emp.FindControl("txtenm")).Text + "') and id<>'" + ViewState["id"].ToString() + "'";
com.CommandText = "select_record_name_id";
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@enm",((TextBox)frm_emp.FindControl("txtenm")).Text);
com.Parameters.AddWithValue("@eid",ViewState["id"].ToString());
ds = new DataSet();
adp = new SqlDataAdapter(com);
adp.Fill(ds);
if (ds.Tables[0].Rows.Count>0)
{
Response.Write("name already exist");
}
else
{
com = new SqlCommand();
com.Connection = con;
//com.CommandText = "update emp_data set id='" + ((TextBox)frm_emp.FindControl("txtid")).Text + "',name='" + ((TextBox)frm_emp.FindControl("txtenm")).Text + "',designation='" + ((TextBox)frm_emp.FindControl("txtdesignation")).Text + "',jdate='" + ((TextBox)frm_emp.FindControl("txtjdate")).Text + "' where id='" + ViewState["id"].ToString() + "'";
com.CommandText = "update_record";
com.CommandType = CommandType.StoredProcedure;
com.Parameters.AddWithValue("@eid", ((TextBox)frm_emp.FindControl("txtid")).Text);
com.Parameters.AddWithValue("@ename", ((TextBox)frm_emp.FindControl("txtenm")).Text);
com.Parameters.AddWithValue("@desg", ((TextBox)frm_emp.FindControl("txtdesignation")).Text);
com.Parameters.AddWithValue("@ejdate", ((TextBox)frm_emp.FindControl("txtjdate")).Text);
com.Parameters.AddWithValue("eidcheck", ViewState["id"].ToString());
com.ExecuteNonQuery();
con.Close();
//com = new SqlCommand("select * from emp_data");
/*com = new SqlCommand();
com.CommandText = "selectrecord";
com.CommandType = CommandType.StoredProcedure;
com.Connection = con;
ds = new DataSet();
adp = new SqlDataAdapter(com);
adp.Fill(ds);
grdemp.DataSource = ds;
grdemp.DataBind();*/
binddata();
Response.Write("record edited succesfully");
grdemp.Visible = true;
frm_emp.Visible = false;
//con.Close();
}

}
catch (Exception E)
{
Response.Write("record not edited");
}
}

}

i have one master page which contain the menu and its menuitem.
i have to access the menu or menuitem in my other .cs file(it has master page)?
how can i access this?

If what you asking is how to access controls in a Master Page from code-behind...

MyMasterPage myMaster = (MyMasterPage)this.Master;

string ImgStr = "images/test.gif"; 

//Calling a method from MyMasterPage
myMaster.setMasterHeaderImages(ImgStr);
myMaster.Page.Title = "Test Page Title";

Check http://aspadvice.com/blogs/kiran/archive/2005/11/27/14016.aspx[^] here.

i have menu in master page and i have to access it in other cs(eg. default.aspx.cs) file.

ContentPlaceHolder content;
content = Master.FindControl("ContentPlaceHolder1") as ContentPlaceHolder;
for ex
TextBox txt=content.FindControl("txtName") as TextBox;

Raju.M