How do I fetch the value to textbox with field textmode time

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C#3.5

as i am new to asp.net
i am having an gridview with an TemplateField textbox whose textmode="time"
now i need to save the value of textbox to database on button click

i am using
TextBox intime = (GridView1.Rows[i].Cells[3].FindControl("txtintime") as TextBox);

this code but at run time it is having an empty string "" in intime.text; can anyone help me out

What I have tried:

i am using
TextBox intime = (GridView1.Rows[i].Cells[3].FindControl("txtintime") as TextBox);

or

string me = Convert.ToDateTime(intime.Text).ToShortTimeString();

this code but at run time it is having an empty string "" in intime.text; can anyone help me out