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Creating variables from dynamically created Text boxes and labels using C#

I am wanting to use to names assigned using .Name to input from text boxes then calculate and output to the labels.
Not sure how I can refer to these inputs as they currently have names but no assigned variables.
Sorry if I don't make much sense I am not a very proficient coder.
public partial class Form1 : Form
{
List<TextBox> Txt1 = new List<TextBox>();
public Form1()
{
InitializeComponent();
for (int i = 0; i < 4; i++)
{
for(int j = 0; j < 7; j++)
{
if (j == 0)
{
var txtbox = new TextBox();
txtbox.Location = new Point(163 + (i * 220), (36));
txtbox.Name = i + "Names";
txtbox.Text = txtbox.Name;
txtbox.Width = 40;
this.Controls.Add(txtbox);
}
else if (j>0 && j<6)
{
var extratxt = new TextBox();
extratxt.Location = new Point(163 + (i * 220), (36+ 36 * j));
extratxt.Name = i + "Input" + j;
extratxt.Text = extratxt.Name;
extratxt.Width = 70;
this.Controls.Add(extratxt);
var percentbox = new Label();
percentbox.Location = new Point(163 + (90+ i * 220), (36 + 36 * j));
percentbox.Name = i + "Percent" + j;
percentbox.Text = percentbox.Name;
percentbox.Width = 50;
this.Controls.Add(percentbox);
var gradebox = new Label();
gradebox.Location = new Point(163 + (150 + i * 220), (36 + 36 * j));
gradebox.Name = i + "Grade" + j;
gradebox.Text = gradebox.Name;
gradebox.Width = 50;
this.Controls.Add(gradebox);
}
else
{
var totals = new Label();
totals.Location = new Point(163 + (i * 220), (36 + 36 * j));
totals.Name = i + "Total";
totals.Text = totals.Name;
totals.Width = 40;
this.Controls.Add(totals);
...
}
...
}
}
}
}

Hope I understand you correctly.
Basically, your difficulty is how to access the instance stored in list of the dynamically create controls by their name, right?
Well, you can use .FirstOrDefault() to select instance with a specific property. For example,
private void Form1_Load(object sender, EventArgs e)
{
List<TextBox> tbList = new List<TextBox>();
for (int i = 0; i < 3; i++)
{
TextBox tb = new TextBox();
tb.Text = "Test" + i.ToString();
tb.Name = "TextBox" + (i + 1).ToString();
tb.Location = new Point(0, 25 * i);
tb.Tag = i;
tbList.Add(tb);
this.Controls.Add(tb);
}
var tb2 = tbList.FirstOrDefault(tb => tb.Name == "TextBox2");
if (tb2 != null)
tb2.Text = "Modified text";
var sum = tbList.Sum(tb => (int)tb.Tag);
}

How to get the values of button templatefield in Gridview?

I want to display the row details of Gridview when user click the button of template field. I got the output to display the button in a Gridview using template field. But when user click the button it reload the page and display the empty template with rows.
Full Coding of c#
string selectedColumn;
string[] splitSelectedColumn;
string groupByColumn;
string[] splitGroupByColumn;
ArrayList listBtnOrLbl = new ArrayList();
int compareFlag = 0;
protected void btnRefresh_Click(object sender, EventArgs e)
{
selectedColumn = txtColumnNames.Text;
splitSelectedColumn = selectedColumn.Split(',');
groupByColumn = txtGroupBy.Text;
splitGroupByColumn = groupByColumn.Split(',');
string[] compareGroup = new string[splitGroupByColumn.Length];
//Grouping column names using selected column text
int flag = 1;
foreach (string columnName in splitSelectedColumn)
{
flag = 1;
foreach (string groupByName in splitGroupByColumn)
{
if (columnName.Equals(groupByName))
{
flag = 2;
break;
}
}
if (flag == 1)
{
groupByColumn = groupByColumn + "," + columnName;
}
}
// CREATE A TEMPLATE FIELD AND BOUND FIELD
BoundField bfield = new BoundField();
TemplateField[] ttfield = new TemplateField[splitGroupByColumn.Length];
for (int i = 0; i < splitSelectedColumn.Length; i++)
{
if (i < splitGroupByColumn.Length)
{
ttfield[i] = new TemplateField();
ttfield[i].HeaderText = splitGroupByColumn[i];
GridView1.Columns.Add(ttfield[i]);
}
else
{
try
{
bfield.HeaderText = splitSelectedColumn[i];
bfield.DataField = splitSelectedColumn[i];
Response.Write("<br/>BOUND FIELD==" + splitGroupByColumn[i]);
GridView1.Columns.Add(bfield);
}
catch (Exception)
{
}
}
}
// CREATE DATA TABLE and COLUMN NAMES
DataTable dt = new DataTable();
//dt.Columns.Clear();
for (int i = 0; i < splitSelectedColumn.Length; i++)
{
dt.Columns.Add(splitSelectedColumn[i]);
//Console.WriteLine(splitSelectedColumn[i]);
System.Diagnostics.Debug.WriteLine(splitSelectedColumn[i]);
Response.Write("<br/>DT COLUMN NAMES==" + splitSelectedColumn[i]);
}
//ADD ROWS FROM DATABASE
string cs = ConfigurationManager.ConnectionStrings["connectionStringDB"].ConnectionString;
//int compareFlag = 0;
using (SqlConnection con = new SqlConnection(cs))
{
SqlCommand cmd = new SqlCommand();
cmd.Connection = con;
//cmd.CommandText = "select " + selectedColumn + " FROM [RMSDemo].[dbo].[ItemRelation] where ItemLookupCode='" + txtItemLookupCode.Text + "'and ChildItemLookupCode1='" + txtChildItemLookupCode.Text + "' group by " + groupByColumn + " ";
cmd.CommandText = "select " + selectedColumn + " FROM [RMSDemo].[dbo].[ItemRelation] group by " + groupByColumn + " ";
con.Open();
SqlDataReader rd = cmd.ExecuteReader();
string addData = string.Empty;
string[] stackss = new string[splitSelectedColumn.Length];
while (rd.Read())
{
//SET the FIRST VALUES in `stackss[]` for comparing next values of rd[]
if (compareFlag == 0)
{
for (int i = 0; i < splitGroupByColumn.Length; i++)
{
compareGroup[i] = rd[splitGroupByColumn[i]].ToString();
Response.Write("<br/>COMPARE GROUP [i]==" + compareGroup[i]);
}
compareFlag = 1;
Response.Write("<br/>splitSelectedColumn.LENGTH==" + splitSelectedColumn.Length);
Response.Write("<br/>STACK.LENGTH==" + stackss.Length);
for (int i = 0; i < stackss.Length; i++)
{
stackss[i] = "";
}
for (int i = 0; i < compareGroup.Length; i++)
{
stackss[i] = compareGroup[i];
}
//TESTING PURPOSE ONLY
for (int i = 0; i < stackss.Length; i++)
{
//stack[i] = "";
Response.Write("<br/>STACK.VALUES==" + stackss[i]);
}
var row = dt.NewRow();
DataRowCollection drc = dt.Rows;
DataRow rowss = drc.Add(stackss);
Response.Write("Execute BUTTON");
listBtnOrLbl.Add("button");
}
//stackss = new string[] { "" };
for (int i = 0; i < stackss.Length; i++)
{
stackss[i] = "";
}
int tempValue = 0;
for (int i = 0; i < compareGroup.Length; i++)
{
if (compareGroup[i] == rd[i].ToString())
{
tempValue = tempValue + 1;
if (tempValue == compareGroup.Length)
{
for (int k = 0; k < splitSelectedColumn.Length; k++)
{
stackss[k] = rd[k].ToString();
Response.Write("second rowsssss ==== " + stackss[k]);
if (k + 1 == splitSelectedColumn.Length)
{
var row = dt.NewRow();
DataRowCollection drc = dt.Rows;
DataRow rowss = drc.Add(stackss);
Response.Write("compare flag checking");
Response.Write("Execute LABEL");
listBtnOrLbl.Add("label");
compareFlag = 0;
}
}
}
}
}
//GridView1.DataSource = dt;
//GridView1.DataBind();
}
rd.Close();
GridView1.DataSource = dt;
GridView1.DataBind();
}
}
Gridview templatefield will generate when user click Refresh button. The above coding is that one to generate column and templatefield
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
Response.Write("<br/>compare flag checking OVER button count=======================" + listBtnOrLbl.Count);
if (e.Row.RowType == DataControlRowType.DataRow)
{
int size = splitGroupByColumn.Length;
//Button[] lnkBtn = new Button[size];
Label[] lblData = new Label[size];
Response.Write("<br/>Inside button count=======================" + listBtnOrLbl.Count);
if ("button".Equals(listBtnOrLbl[j]))
{
for (int i = 0; i < splitGroupByColumn.Length; i++)
{
Button lnkView = new Button();
lnkView.ID = "lnkView";
lnkView.Text = (e.Row.DataItem as DataRowView).Row[splitGroupByColumn[i]].ToString();
//lnkView.Text = (e.Row.DataItem as DataRowView).Row["Id"].ToString();
lnkView.Click += ViewDetails;
lnkView.CommandArgument = (e.Row.DataItem as DataRowView).Row[splitGroupByColumn[i]].ToString();
e.Row.Cells[i].Controls.Add(lnkView);
}
j++;
}
else
{
for (int i = 0; i < splitGroupByColumn.Length; i++)
{
lblData[i] = new Label();
lblData[i].ID = "lblView";
lblData[i].Text = (e.Row.DataItem as DataRowView).Row[splitGroupByColumn[i]].ToString();
Response.Write("<br/>PRINT label==" + lblData[i].Text);
e.Row.Cells[i].Controls.Add(lblData[i]);
//e.Row.Visible = false;
}
j++;
}
}
protected void ViewDetails(object sender, EventArgs e)
{
Response.Redirect("exit.aspx"); //for testing purpose I gave like this, But this method is not calling i think when user clicks button
Response.Write("testing....");
ClientScript.RegisterStartupScript(this.GetType(), "alert", "alert('TESTING:')", true);
}
Output before user clicks the Button
output1
After clicks the button(first button)
output2
I already did like this before,but that was small one not more complex code like this. that was working fine. Now What i did wrong here?.
Thanks
I think ViewDetails() method is not calling when user clicks the button

how to create onclick event for dynamically generated buttons

this is how i was generating buttons and on click event for the buttons.but every time on button click its taking the max value rather than the button clicked
int noofquestions = 100;
int k = 1;
for (int i = 1; i <= noofquestions / 5; i++)
{
HtmlTableRow tRow = new HtmlTableRow();
//TableRow tRow = new TableRow();
myTable.Rows.Add(tRow);
for (int j = 1; j <= 5; j++)
{
HtmlTableCell tCell = new HtmlTableCell();
tRow.Cells.Add(tCell);
Button link = new Button();
//LinkButton link = new LinkButton();
link.ID = "link" + k;
link.Text = k.ToString();
tCell.Controls.Add(link);
ViewState["qno"] = k;
link.Click += new EventHandler(link_Click);
tCell.Controls.Add(link);
//link.Click += new EventHandler(this.btn_click);
k = k + 1;
}
}
void link_Click(object sender, EventArgs e)
{
}

It is up to how you read value.
I think my meaning max value you are questioning that when you read ViewState["qno"] it is max value because it is what it set to that.
In stead of that just try to read from some other property.
void link_Click(object sender, EventArgs e)
{
//If you do ViewState["qno"] it will be max value of K instead do following thing.
}
// Do following update
int noofquestions = 100;
int k = 1;
for (int i = 1; i <= noofquestions / 5; i++)
{
HtmlTableRow tRow = new HtmlTableRow();
//TableRow tRow = new TableRow();
myTable.Rows.Add(tRow);
for (int j = 1; j <= 5; j++)
{
HtmlTableCell tCell = new HtmlTableCell();
tRow.Cells.Add(tCell);
Button link = new Button();
//LinkButton link = new LinkButton();
link.ID = "link" + k;
link.Text = k.ToString();
tCell.Controls.Add(link);
ViewState[link.ID] = k;
link.Click += new EventHandler(link_Click);
tCell.Controls.Add(link);
//link.Click += new EventHandler(this.btn_click);
k = k + 1;
}
}
void link_Click(object sender, EventArgs e)
{
Button b = (sender)Button;
string value = ViewState[b.ID].ToString();
}

Dynamic rows on table c#

two part question:
1:
I am using a session state refresh to hold count of the page reloads but when using a series of if statements the validation isn't working. Code at the bottom. What am I doing wrong?
2:
Using session state against postback doesn't appear to be the most efficient method of doing this, if I added another table with the same functionality, the count would affect both tables.
For example if I only wanted people to be able to add a maximum of three rows to a table, on two tables, they would only be able to add four rows in total.
What would be a better method of storing a count for separate refreshes?
Update
I have found the issue with the code not adding rows to the existing but I'm unsure of how to fix it.
Basically each iteration is deleting the existing row then adding a single row again. So there will never be more than one row.
Any ideas?
namespace FormTest
{
public partial class About : Page
{
protected void Page_Load(object sender, System.EventArgs e)
{
tbl.BorderStyle = BorderStyle.Inset;
tbl.BorderWidth = Unit.Pixel(1);
if (!Page.IsPostBack)
{
Session["count"] = 0;
}
else
{
int count = (int)Session["count"];
count++;
Session["count"] = count;
}
}
protected void cmdCreate_Click(object sender, System.EventArgs e)
{
tbl.Controls.Clear();
int rows = 1;
int cols = 4;
if ((int)Session["count"] == 0)
{
for (int i = 0; i < rows; i++)
{
TableRow rowNew = new TableRow();
tbl.Controls.Add(rowNew);
for (int j = 0; j < cols; j++)
{
TableCell cellNew = new TableCell();
Label lblNew = new Label();
lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";
TextBox tbNew = new TextBox();
cellNew.Controls.Add(lblNew);
cellNew.Controls.Add(tbNew);
rowNew.Controls.Add(cellNew);
}
}
}
else
{
if ((int)Session["count"] == 1)
{
for (int i = 0; i < rows; i++)
{
TableRow rowNew = new TableRow();
tbl.Controls.Add(rowNew);
for (int j = 0; j < cols; j++)
{
TableCell cellNew = new TableCell();
Label lblNew = new Label();
lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";
TextBox tbNew = new TextBox();
cellNew.Controls.Add(lblNew);
cellNew.Controls.Add(tbNew);
rowNew.Controls.Add(cellNew);
}
}
}
else
{
if ((int)Session["count"] == 2)
{
for (int i = 0; i < rows; i++)
{
TableRow rowNew = new TableRow();
tbl.Controls.Add(rowNew);
for (int j = 0; j < cols; j++)
{
TableCell cellNew = new TableCell();
Label lblNew = new Label();
lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";
TextBox tbNew = new TextBox();
cellNew.Controls.Add(lblNew);
cellNew.Controls.Add(tbNew);
rowNew.Controls.Add(cellNew);
}
}
}
else
{
if ((int)Session["count"] == 3)
{
for (int i = 0; i < rows; i++)
{
TableRow rowNew = new TableRow();
tbl.Controls.Add(rowNew);
for (int j = 0; j < cols; j++)
{
TableCell cellNew = new TableCell();
Label lblNew = new Label();
lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";
TextBox tbNew = new TextBox();
cellNew.Controls.Add(lblNew);
cellNew.Controls.Add(tbNew);
rowNew.Controls.Add(cellNew);
}
}
}
else
{
Response.Redirect("http://www.google.co.uk");
}
}
}
}
}//end cmdCreate_Click
}
}

You don't need a list of if conditions, you just need to ensure the number of rows is less than your desired limit. You also should store the limit per table to avoid your count clashing if/when more tables are added.
This is how I would do it:
(note: This won't work "as-is" - I've assumed you've removed the code to assign tbl within cmdCreate_Click()and have left it as is for clarity)
namespace FormTest
{
public partial class About : Page
{
private int myFirstTableMaxRows = 3;
protected void Page_Load(object sender, System.EventArgs e)
{
tbl.BorderStyle = BorderStyle.Inset;
tbl.BorderWidth = Unit.Pixel(1);
if (!Page.IsPostBack)
{
Session["myFirstTable_count"] = "0";
}
else
{
int count = (int)Session["myFirstTable_count"];
Session["myFirstTable_count"] = ++count;
}
}
protected void cmdCreate_Click(object sender, System.EventArgs e)
{
tbl.Controls.Clear();
int cols = 4;
int currentRowCount = (int)Session["myFirstTable_count"];
if(currentRowCount <= myFirstTableMaxRows)
{
TableRow rowNew = new TableRow();
tbl.Controls.Add(rowNew);
for (int j = 0; j < cols; j++)
{
TableCell cellNew = new TableCell();
Label lblNew = new Label();
lblNew.Text = "(" + i.ToString() + "," + j.ToString() + ")<br />";
TextBox tbNew = new TextBox();
cellNew.Controls.Add(lblNew);
cellNew.Controls.Add(tbNew);
rowNew.Controls.Add(cellNew);
}
}
else
{
Response.Redirect("http://www.google.co.uk");
}
}//end cmdCreate_Click
}
Update after question edit
The existing rows will go due to this line in the code:
tbl.Controls.Clear();
The table is being cleared, then a single row is added per the logic in the cmdCreate_Click() method.

Cannot fire runtime radiobutton checkedchanged event inside linkbutton click event

I am trying to fire radiobutton checked changed event on linkbutton click event but instead it goes to the page load and the radiobutton checkedchanged event does not fires.
protected void Page_Load(object sender, EventArgs e)
{
string Query = "select Q101004,Q101005 from Q101 where Q101001<110000013";
DataTable dt = ExecuteDataset(Query).Tables[0];
ViewState["dt"] = dt;
Table t = new Table();
TableRow r = new TableRow();
t.Rows.Add(r);
TableCell c = new TableCell();
lnkbtn = new LinkButton();
r.Cells.Add(c);
lnkbtn.Text = "Click Here";
lnkbtn.Visible = true;
lnkbtn.CommandName = "Test";
lnkbtn.CommandArgument = "Hi";
lnkbtn.ID = "Hi";
PlaceHolder2.Controls.Add(lnkbtn);
for (int i = 0; i < dt.Rows.Count; i++)
{
rb = new RadioButton();
rb.AutoPostBack = true;
rb.ID = "m" +i;
rb.GroupName = "a";
rb.Text = dt.Rows[0][0].ToString();
CbxList = new CheckBoxList();
CbxList.ID = "Cbx"+i;
CbxList.Enabled = false;
CbxList.RepeatDirection = RepeatDirection.Horizontal;
CbxList.RepeatColumns = 2;
CbxList.CellPadding = 10;
CbxList.CellSpacing = 5;
CbxList.RepeatLayout = RepeatLayout.Table;
options = dt.Rows[0][1].ToString().Split('~');
PlaceHolder2.Controls.Add(new LiteralControl("<br/>"));
for (int j = 0; j < options.Length; j++)
{
CbxList.Items.Add(new ListItem(options[j], options[j]));
}
PlaceHolder2.Controls.Add(rb);
PlaceHolder2.Controls.Add(CbxList);
if (i ==0)
rb.CheckedChanged += new EventHandler(rb_CheckedChanged);
else
lnkbtn.Click += new EventHandler(lnkbtn_Click);
}
}
void lnkbtn_Click(object sender, EventArgs e)
{
DataTable dt = (DataTable)ViewState["dt"];
lnkbtn = (LinkButton)PlaceHolder2.FindControl("Hi");
string str=((LinkButton)sender).CommandArgument;
//lnkbtn.Enabled = true;
if (lnkbtn.ID == str)
{
rb = new RadioButton();
rb.AutoPostBack = true;
rb.ID = "m";
rb.GroupName = "a";
rb.Text = dt.Rows[0][0].ToString();
CbxList = new CheckBoxList();
CbxList.ID = "Cbx";
CbxList.Enabled = false;
CbxList.RepeatDirection = RepeatDirection.Horizontal;
CbxList.RepeatColumns = 2;
CbxList.CellPadding = 10;
CbxList.CellSpacing = 5;
CbxList.RepeatLayout = RepeatLayout.Table;
options = dt.Rows[0][1].ToString().Split('~');
PlaceHolder2.Controls.Add(new LiteralControl("<br/>"));
for (int i = 0; i < options.Length; i++)
{
CbxList.Items.Add(new ListItem(options[i], options[i]));
}
PlaceHolder2.Controls.Add(rb);
PlaceHolder2.Controls.Add(CbxList);
if (lnkbtn.CommandName == "Test")
{
rb.CheckedChanged += new EventHandler(rb_CheckedChanged);
}
}
}

Your code subscribes to the checked changed but does not invoke it.
If you want to do this, you could call the rb_CheckedChanged() method directly.

hope this helps....its working fine for me.
Just Modify your code with this code and You will be able to achieve your desired output
private void InitPage()
{
string a1, b,a2,b2;
_objSession = (ClsSession)Session["Login"];
ds = _objSession._DataSet;
dtAll = ds.Tables[3];
dr = dtAll.NewRow();
string str2 = (string)ViewState["str1"];
if (str2 != null)
{
string[] str3 = str2.Split('~');
a2 = str3[0];
b2 = str3[1];
}
else
{
a2 = "a0";
b2 = "b0";
}
str = (string)ViewState["str"];
if (str == null)
{
a1 = "a0";
b = "b";
}
else
{
string[] str1 = str.Split('~');
a1 = str1[0];
b = str1[1];
}
if (str==null)
{
for (int j = 0; j < dtAll.Rows.Count; j++)
{
Table t = new Table();
TableRow r = new TableRow();
t.Rows.Add(r);
TableCell c = new TableCell();
lnkbtn = new LinkButton();
r.Cells.Add(c);
lnkbtn.Text = (j + 1).ToString();
lnkbtn.Visible = true;
lnkbtn.CommandName = "Test";
lnkbtn.CommandArgument = "Hi" + j;
lnkbtn.ID = "Hi" + j;
lnkbtn.ForeColor = Color.Blue;
lnkbtn.Width = 30;
lnkbtn.Font.Bold = true;
lnkbtn.Font.Size = 14;
lnkbtn.Font.Underline = false;
lnkbtn.Click += new EventHandler(lnkbtn_Click);
c.Controls.Add(lnkbtn);
plcHdrLinkButton.Controls.Add(lnkbtn);
}
ViewState["a"] = 0;
}
if (str2 != null)
{
string[] str3 = str2.Split('~');
a2 = str3[0];
a1 = a2;
}
string resultString = Regex.Match(a1, #"\d+").Value;
int a = int.Parse(resultString);
ViewState["a"] = a;
plcHdrQuestion.Controls.Clear();
rb = new RadioButton();
rb.ID = "m" + a;
rb.AutoPostBack = true;
rb.GroupName = "a";
rb.Text = (a + 1) + "." + " " + dtAll.Rows[a][4].ToString();
CbxList = new CheckBoxList();
CbxList.ID = "Cbx" + a;
CbxList.Enabled = false;
CbxList.RepeatDirection = RepeatDirection.Horizontal;
CbxList.RepeatColumns = 2;
CbxList.CellPadding = 10;
CbxList.CellSpacing = 5;
CbxList.RepeatLayout = RepeatLayout.Table;
options = dtAll.Rows[a][5].ToString().Split('~');
plcHdrQuestion.Controls.Add(new LiteralControl("<br/>"));
for (int i = 0; i < options.Length; i++)
{
CbxList.Items.Add(new ListItem(options[i], options[i]));
}
plcHdrQuestion.Controls.Add(rb);
plcHdrQuestion.Controls.Add(CbxList);
rb.CheckedChanged += new EventHandler(lnkbtn_Click);
string st = (string)ViewState["str"];
ViewState["str1"] = st;
ViewState["str"] = null;
}
protected void lnkbtn_Click(object sender, EventArgs e)
{
Boolean _flag=true;
ds = _objSession._DataSet;
dt1 = ds.Tables[3];
dr = dt1.NewRow();
StringBuilder sb=new StringBuilder ();
for (int i = 0; i < dt1.Rows.Count; i++)
{
Cbx = (RadioButton)plcHdrQuestion.FindControl("m" + i);
Cbx1 = (CheckBoxList)plcHdrQuestion.FindControl("Cbx" + i);
if (Cbx != null)
{
if (Cbx.Checked == true)
{
Cbx1.Enabled = true;
_flag = false;
string st1 = (string)ViewState["st"];
string st="c";
if (st1 != null)
st = st1 + "~" + st;
ViewState["st"] = st;
st1 = (string)ViewState["st"];
sb.Append(st);
}
break;
}
}
int count=(sb.ToString().Count());
if (count>2)
{
_flag = true;
}
if ((lnkbtn.CommandName == "Test") && (_flag ==true))
{
for (int j = 0; j < dt1.Rows.Count; j++)
{
lnkbtn = (LinkButton)plcHdrLinkButton.FindControl("Hi" + j);
string str = ((LinkButton)sender).CommandArgument;
lnkbtn.Enabled = true;
if (lnkbtn.ID == str)
{
ViewState["str"] = str + "~" + lnkbtn.ID;
InitPage();
ViewState["st"] = null;
_flag = false;
break;
}
}
}
}

You need to read up on your ASP.NET Page Life Cycle - http://msdn.microsoft.com/en-us/library/ms178472(VS.100).aspx
Very roughly, the following events get called during page lifecycle.
Init -> Controls are created & wired up with event handlers
Load ViewState/ControlState -> Controls are reset to their previous state from the last round trip (including whether or not they need to fire their events)
Load -> Controls are loaded into the Page's Control Tree
Control Events (Clicks etc...) are executed.
The problem you have is that you are creating your control and wiring it up to fire dynamically in the 4th step there, which is too late in the page lifecycle.
On the next round trip, if someone does interact with that control, and the lifecycle starts over, that control won't exist by the time the page is preparing to execute commands.
You'll need to move the creation of your RadioButton to a much earlier stage in the pages creation. In your updated code, try moving your Page_Load code into the override oninit method instead.