how

Question

hi char digit = Convert.ToChar(((TextBox)sender).Text[0]); iax.sendDTMF(digit); This is the code i was using for textbox under textchanged event.I have a clear button to clear this textbox int len = txtCallTo.Text.Length; if (!(txtCallTo.Text == )) { txtCallTo.Text = txtCallTo.Text.Substring(0 len - 1); } so when i was clearing the textboxthe error is showing index was outside the bounds of array.there is no problem with clearbut with TextBox)sender).Text[0].so how can i do

Rodick Wu · Answer

you need to judge the value of textbox: TextBox textbox=(TextBox)sender; if(!string.isNullOrEmpty(textbox.Text)) { char digit = Convert.ToChar(textbox.Text[0]); iax.sendDTMF(digit); }

Niradhip Chakraborty · Answer

In the page load you can use the focus function.

Rodick Wu · Answer

How to focus a new line?