Question

I have multiple textboxes in my form like txtTask0, txtTask1… txtTask12.

so I want to pass values of those textboxes into my webservice one by one.

for (int i = 0; i <= 12 ; i++)
{
   sOUT = ws_service.InsertAchievement(i,txtTask0.Text,txtAchieve0.Text);              
}

Here instead of passing txtTask0.text I need to pass the “i” value one by one like

txtTask[i].text

something similar to this

TextBox tb = (TextBox) Controls["txtTask" + i];

from this link
But that code results in error like

Error   92  The best overloaded method match for 'System.Web.UI.ControlCollection.this[int]' has some invalid arguments 

How can I pass multiple textbox values into the loop.?

Answer 1

You cant do like that, because the Controls[index] expects an integer as its parameter, but you are passing a “string concatenated with an integer” it wont work, instead you do like below it will work, hope it will help you…

            foreach (Control c in this.Controls)
            {
                int i = 0;
                if (c is TextBox)
                {
                    while(i < 10)
                    {
                        if (c.Name == "txtTask" + i)
                        {
                            MessageBox.Show("This is textBox" + i);
                        }
                        i++;
                    }
                }
            }

EDIT :

If the condition if(c is TextBox) is not parsing correctly then do like

           foreach (Control c in this.Controls)
            {
                int i = 0;
                while (i < this.Controls.Count)
                {
                    if (c.Name == "txtTask" + i)
                    {
                        MessageBox.Show("This is textBox" + i);
                    }
                    i++;
                }
            }

EDIT 2:

Or Simply if you want to loop out in all textbox controls in aspx page use this following code part. It works very perfectly..

        int count = 0;
        foreach (Control c in this.Page.Controls)
        {
            foreach (Control c1 in c.Controls)
            {
                int i = 0;
                if (c1 is TextBox)
                {
                    while (i < 10)
                    {
                        if (c1.ID == "TextBox" + i)
                        {
                            count++;
                        }
                        i++;
                    }
                }
            }
        }
        Label1.Text = count + " textbox(es) has been found";