c# - why does my app complaints about a missing SQL parameter when i already supplied it? -


i have stored procedure takes 18 parameters , 1 parameter annoys me. have passed blob value of type varbinary(max) image. default pass null image. though i've passed parameter , when ran it, has given me following error 

procedure or function 'uspsvupdtcourse' expects parameter '@pbookimage', not supplied.

but can see in first image have passed parameter

first image-c# code throw exception

second image- sql store procedure

is there away fix or need further details, stored procedure on going thing, not logic error , else.. : (

in stored procedure check input param looks 

  @pbookimage varbinary(max) = null

this accept null parameter in sp


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