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Can I loop through textbox id’s to check values in asp.net

Pravesh Singh 1992 14-Nov-2014

I'm working on a project and I'm a beginner and I'm having a little trouble with this. I'm trying to check if a textbox is empty and if it is to change the value to N/A so that I can input n/a into a database instead of it not working.

Here is the code that I thought would work but didn't because the .Text property isn't near the ID anymore:

for(int i = 1; i<=17; i++)
{
if(!("tb" + i).Text)
"tb" + i.Text = "n/a";
}

I wasn't sure if the true/false would work but I never got to find out because it doesn't compile to begin with. I have 17 textboxes on my design page all with ID 'tb + i' e.g tb1, tb2

asp.net c#  loop 
Updated on 14-Nov-2014
Pravesh Singh

Pravesh Singh

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1 Answers

Samuel Fernandes

Samuel Fernandes

14-Nov-2014

If you want to loop through the textbox ids, you have to find the control on the page first using the FindControl method.

Then you can create your loop like this:

TextBox txt;
for(int i = 1; i<=17; i++)
{
    txt = (TextBox)Page.FindControl("tb" + i);
    if(string.IsNullOrEmpty(txt.Text))
        txt.Text = "n/a";
}

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