Genrating controls at run time - assingn event handler to dynamic button

[manjeet799]

Hi,

I am creating some controls on run time on click event of button.
I create two drop downs and one button on the click of existing button place on the form at design time.

The problem is :
1) I am not able to specify the click event of dynamicly generated button.

Alternatively I tried generating controls on the clickevent of same button again and again.

Then new problem is that
When i click the button first time it generates the controls,
but when clicked second time page is posted back and I call same function with different parameter, controls previously generated disappear and new controls come.

Please tell me how can i genrate these controls.
I don't want to loose previously generated controls.

The code is here


protected void btnAddRows_Click(object sender, EventArgs e)

{

int i = Convert.ToInt16 (Session["i"]);

Response.Write("AAA");


fnGenerateRows(i);


}



// function that genrated the rows and controls

public void fnGenerateRows(int i)

{

// Total number of rows

Response.Write("BBB");

int rowCtr;


// Total number of cells per row (columns)

int cellCtr;

//int ag = 0;

for (rowCtr = i; rowCtr < i+1; rowCtr++)

{


HtmlTableRow tRow = new HtmlTableRow();

TABLE1.Rows.Add(tRow);

int k = i;

for (cellCtr = k; cellCtr < k+2; cellCtr++)

{

HtmlTableCell tCell = new HtmlTableCell();

tRow.Cells.Add(tCell);

Label lbl = new Label();

lbl.EnableViewState = true;

if (cellCtr == k && rowCtr == k)

{

lbl.ID = "lblDestination" + rowCtr + cellCtr;

lbl.Text = "lblDestination" + rowCtr + cellCtr;

tCell.Controls.Add(lbl);

DropDownList ddlDestination = new DropDownList();

ddlDestination.ID = "ddlDestination" + rowCtr + cellCtr;

tCell.Controls.Add(ddlDestination);

}

else if (cellCtr == k+1 && rowCtr == k)

{

lbl.ID = "lblDestination" + rowCtr + cellCtr;

lbl.Text = "lblDestination" + rowCtr + cellCtr;

tCell.Controls.Add(lbl);

DropDownList ddlDestination = new DropDownList();

ddlDestination.ID = "ddlDestination" + rowCtr + cellCtr;

tCell.Controls.Add(ddlDestination);

}

else if (rowCtr == k+1 && cellCtr == k)

{

lbl.ID = "lblDestination" + rowCtr + cellCtr;

lbl.Text = "Destination6";

tCell.Controls.Add(lbl);

DropDownList ddlDestination = new DropDownList();

ddlDestination.ID = "ddlDestination" + rowCtr + cellCtr;

tCell.Controls.Add(ddlDestination);

}

else if (rowCtr == k+1 && cellCtr == k+1)

{

lbl.ID = "lblDestination" + rowCtr + cellCtr;

lbl.Text = "Destination7";

tCell.Controls.Add(lbl);

DropDownList ddlDestination = new DropDownList();

ddlDestination.ID = "ddlDestination" + rowCtr + cellCtr;

tCell.Controls.Add(ddlDestination);


}



}

HtmlTableCell tCell1 = new HtmlTableCell();

tRow.Cells.Add(tCell1);

Button btn = new Button();

btn.ID = "btn" + rowCtr + cellCtr;

btn.Text = Convert .ToString (++k);

k--;


//btn.Click += new System.EventHandler(ButtonClick);



tCell1.Controls.Add(btn);

}

i++;

Session["i"] = i;



}


I am getting the value of i from session and updating it to give controls different id

[vinyl-junkie]

I believe you can have your button on your page and just have it as visible="false". Have your click event change that to visible="true". Would that work for you?

BTW, you really need to include your posted code within code tags. ;)

[manjeet799]

Hi,

Thanks for the solution of assigning the event to button.

But When I click the button 2nd time previously generated controls disappear.

How to retain those ??