Dynamic control creation. Please help...

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  • Start date Start date
G

Guest

Scenario: I'm trying to create, based on a value from a drop-down list (1-100), a dynamic table row that contains a text box using the following code

//get the number from the combo bo
intNumWings = Convert.ToInt16(cboNumWings.SelectedValue)
//create a new table ro
HtmlTableRow rowText = new HtmlTableRow()
for (Int16 i = 1; i <= intNumWings; i++) {//begin creating wing text boxe
//create blank table element
HtmlTableRow rowWing = new HtmlTableRow()
HtmlTableCell celLabel = new HtmlTableCell()
HtmlTableCell celText = new HtmlTableCell()
TextBox txtWing = new TextBox ()
//set element propertie
celLabel.InnerHtml= "<b>Wing " + i + "<b>"
celLabel.Attributes.Add("width", "92")
txtWing.ID= "txtWing_" + Convert.ToString(i)
txtWing.Width= Unit.Pixel(283)
//add text box to table cel
celText.Controls.Add(txtWing)
//add cells to ro
rowWing.Cells.Add(celLabel)
rowWing.Cells.Add(celText)
//add row to tabl
tblWingSetup.Rows.Add(rowWing)
}//end wing text boxe
//add row to tabl
tblWingSetup.Rows.Add(rowText)

Problem: Every time I try to get the information from the text box using the FindControl method I keep receiving "Object reference not set to an instance of an object" error using the following code

TextBox myText = new TextBox ()
myText = (TextBox)FindControl ("_ctl0_txtWing_1");
Response.Write(myText.ClientID)
*I had to use the '_ctl0_' prefix, because when I opened the resulting HTML page I noticed this prefix. Now, I also receive the same message without the prefix too

Any help would be greatly appreciated
Jim
 
Do you know which like it's breaking on?

Jim Mace said:
Scenario: I'm trying to create, based on a value from a drop-down list
Click to expand...
(1-100), a dynamic table row that contains a text box using the following
code:
//get the number from the combo box
intNumWings = Convert.ToInt16(cboNumWings.SelectedValue);
//create a new table row
HtmlTableRow rowText = new HtmlTableRow();
for (Int16 i = 1; i <= intNumWings; i++) {//begin creating wing text boxes
//create blank table elements
HtmlTableRow rowWing = new HtmlTableRow();
HtmlTableCell celLabel = new HtmlTableCell();
HtmlTableCell celText = new HtmlTableCell();
TextBox txtWing = new TextBox ();
//set element properties
celLabel.InnerHtml= "<b>Wing " + i + "<b>";
celLabel.Attributes.Add("width", "92");
txtWing.ID= "txtWing_" + Convert.ToString(i);
txtWing.Width= Unit.Pixel(283);
//add text box to table cell
celText.Controls.Add(txtWing);
//add cells to row
rowWing.Cells.Add(celLabel);
rowWing.Cells.Add(celText);
//add row to table
tblWingSetup.Rows.Add(rowWing);
}//end wing text boxes
//add row to table
tblWingSetup.Rows.Add(rowText);

Problem: Every time I try to get the information from the text box using
Click to expand...
the FindControl method I keep receiving "Object reference not set to an
instance of an object" error using the following code:
TextBox myText = new TextBox ();
myText = (TextBox)FindControl ("_ctl0_txtWing_1");*
Response.Write(myText.ClientID);
*I had to use the '_ctl0_' prefix, because when I opened the resulting
Click to expand...
HTML page I noticed this prefix. Now, I also receive the same message
without the prefix too.
 
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