Multiple Textbox values into database - asp.net

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";