I am having an error in below code.

you colud assign value to variable then pass the value to parameter this easy to find value avaliable or not.

 

like this 

var smain_mm=(form1.FindControl("txt_smain_mm") as TextBox).Text;

cmd.Parameters.AddWithValue("@submain_mm", Convert.ToInt32(smain_mm.Trim())); 

sir, 

I have attached debuge screens.please help me to solve that error

Here couldn't see the value getting inside that text box during run time. What I am asking, only take below portion of the code and store the value in a variable, just before executing that line producing error, so that we can see what value is getting inside this textbox during run time.

 

 

sir,

I have attached the debuge screen.

No sir,

Its not, I'm putting numeric value in it