[c#] Getting the .Text value from a TextBox

I have a bunch of textboxes on my asp.net page, and on TextChanged event, I want to run a stored proc to return a Name, based on user input. If I have a block of code like:

TextBox t = (TextBox)sender;
string objTextBox = t.ID;

how can I get the .Text value of objTextBox?

Did you try using t.Text?

if(sender is TextBox) {
 var text = (sender as TextBox).Text;
}