How do I access controls in HTMLTABLE using ASP.NET C#

Question

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Hey All,
trying to access controls from HtmlTable but getting this error

Specified argument was out of the range of valid values.

what is the right way to fetch any control from html table with ID
will deeply appreciate your help.
Have a good one

What I have tried:

C#

HtmlTable tbl = new HtmlTable();
            HtmlTableRow tr= new HtmlTableRow();
            HtmlTableCell td1 = new HtmlTableCell();
            HtmlTableCell td2 = new HtmlTableCell();
            TextBox t1 = new TextBox();
            t1.ID = "t1_id";
            TextBox t2 = new TextBox();
            t2.ID = "t2_d";
            t1.Text = "hello";
            t2.Text = "friend";
            tbl.Border = 2;
            td1.Controls.Add(t1);
            td1.Controls.Add(t2);
            tr.Controls.Add(td1);
            tr.Controls.Add(td2);
            tbl.Controls.Add(tr);
            form1.Controls.Add(tbl);
            for (int i = 0; i <= tbl.Rows.Count - 1; i++)
            {
                for (int j = 0; j <= tbl.Rows[i].Cells.Count - 1; j++)
                {
                    TextBox tbox = (TextBox)tbl.Rows[i].Cells[j].Controls[j];   //causing error
                    Response.Write(tbox.ID);
                                    }
            }

Posted 18-Oct-20 21:51pm

Aftab Iqbal Clips

Updated 19-Oct-20 2:12am

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Comments

BillWoodruff 19-Oct-20 4:45am

isn't this the same question you asked here, recently: https://www.codeproject.com/Questions/5282729/How-do-I-add-dynamic-controls-to-htmltable-using-A

Aftab Iqbal Clips 19-Oct-20 4:59am

that was about adding controls to HtmlTable.but now i want to access themfrom HtmlTable

F-ES Sitecore 19-Oct-20 6:12am

The solution is roughly the same solution I gave to your other question.

Aftab Iqbal Clips 19-Oct-20 7:50am

that doesn't work at that time so i have to use another approach to accomplish the task.anyways leave it there.
can you please have a look at this problem.

2 solutions

Solution 1

JavaScript

for (int j = 0; j <= tbl.Rows[i].Cells.Count - 1; j++)
{
    TextBox tbox = (TextBox)tbl.Rows[i].Cells[j].Controls[j];   //causing error

Index j is not valid on Controls.

Posted 18-Oct-20 22:03pm

Richard MacCutchan

Comments

Aftab Iqbal Clips 19-Oct-20 4:52am

yes, but how can i fix that

Richard MacCutchan 19-Oct-20 4:57am

Think about what you are doing. How many controls are there in a single cell?

Aftab Iqbal Clips 19-Oct-20 5:14am

it has 1 textbox cell in each row
i am thinking since last 4 hours, i tried this
TextBox tbox = (TextBox)tbl.Rows[i].Cells[j].Controls[0];
and this
TextBox tbox = (TextBox)tbl.Rows[i].Cells[j].Controls;
but couldn't figured it out

Richard MacCutchan 19-Oct-20 5:25am

If it contains a single TextBox then that is not an array, so using an index value to address it makes no sense. Reread the C# documentation on scalar and array variables.

Aftab Iqbal Clips 19-Oct-20 5:40am

yes bro it doesn't make any sense but when i use only controls without giving any index the it gives me syntax error do you have any solution?

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F-ES Sitecore · Accepted Answer · 2020-10-19T02:12:00

You say there is only one textbox per cell, but in your code you add both boxes to the same cell

C#

td1.Controls.Add(t1);
td1.Controls.Add(t2);

Maybe you meant to write this instead

C#

td1.Controls.Add(t1);
td2.Controls.Add(t2);

If that is the case then to refer to the only control in a collection just use the 0 index;

C#

TextBox tbox = (TextBox)tbl.Rows[i].Cells[j].Controls[0];

Alternatively the below is a bit more of a robust way of handling the data and will cater for zero, one or more textboxes in a cell.

C#

for (int i = 0; i <= tbl.Rows.Count - 1; i++)
{
    for (int j = 0; j <= tbl.Rows[i].Cells.Count - 1; j++)
    {
        var textBoxes = tbl.Rows[i].Cells[j].Controls.OfType<TextBox>();
        foreach(TextBox tbox in textBoxes)
        {
            Response.Write(tbox.ID);
        }
    }
}