findcontrol behaviour

[tarscher]

Hi all,

When a user clicks a button controls are generated
protected void keywordsDropDownList_SelectedIndexChanged(object
sender, EventArgs e)
{
int numberOfTextBoxes =
Convert.ToInt16(keywordsDropDownList.Text);
TextBox myTextBox;

for (int i = 0; i < numberOfTextBoxes; i++)
{
myTextBox = new TextBox();
myTextBox.ID = "parameterTextBox" + Convert.ToString(i);
myTextBox.Columns = 5;
buttonPlaceHolder.Controls.Add(myTextBox);
}
addKeywordButton.Visible = true;
MultiView1.SetActiveView(KeywordView);

TextBox myTB;
myTB =
(TextBox)buttonPlaceHolder.FindControl("parameterT extBox1");
}

The FindControl finds the parameterTextBox1 and copies it to myTB
correctly.

When a user now clicks a button after he clicked the previous one I do:
protected void addKeywordButton_Click(object sender, EventArgs e)
{
TextBox myTB;
myTB =
(TextBox)buttonPlaceHolder.FindControl("parameterT extBox1");
}

Here FindControl can't find the control and myTB is null.

I really can't find the problem so any help is greatly appreciated.

best regards
Stijn

[Michael]

Stijn,

The problem is that ASP.NET is stateless and on each postback you need to
create the controls (or persist the controls after they are created). A
quick search turned up the following that may help you.

http://www.tgreer.com/aspnet_html_04.html

Michael

"ta******@gmail.com" wrote:

Hi all,

When a user clicks a button controls are generated
protected void keywordsDropDownList_SelectedIndexChanged(object
sender, EventArgs e)
{
int numberOfTextBoxes =
Convert.ToInt16(keywordsDropDownList.Text);
TextBox myTextBox;

for (int i = 0; i < numberOfTextBoxes; i++)
{
myTextBox = new TextBox();
myTextBox.ID = "parameterTextBox" + Convert.ToString(i);
myTextBox.Columns = 5;
buttonPlaceHolder.Controls.Add(myTextBox);
}
addKeywordButton.Visible = true;
MultiView1.SetActiveView(KeywordView);

TextBox myTB;
myTB =
(TextBox)buttonPlaceHolder.FindControl("parameterT extBox1");
}

The FindControl finds the parameterTextBox1 and copies it to myTB
correctly.

When a user now clicks a button after he clicked the previous one I do:
protected void addKeywordButton_Click(object sender, EventArgs e)
{
TextBox myTB;
myTB =
(TextBox)buttonPlaceHolder.FindControl("parameterT extBox1");
}

Here FindControl can't find the control and myTB is null.

I really can't find the problem so any help is greatly appreciated.

best regards
Stijn