set the value of a int sqlparameter when the value of a drop down list is 0

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<span style="font-size:x-small; font-family:Consolas <span style="font-size:x-small; font-family:Consolas
if a ddl has a value of 0 i want the value of the param to be null. I tried this but get an error because null isnt an int. I would like some thing compact. i tried creating a function but you cant return null if the return type is int
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sqlParams[1] =
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<span style="font-size:x-small; color:#0000ff; font-family:Consolas <span style="font-size:x-small; color:#0000ff; font-family:Consolas <span style="font-size:x-small; color:#0000ff; font-family:Consolas new<span style="font-size:x-small; font-family:Consolas <span style="font-size:x-small; font-family:Consolas
<span style="font-size:x-small; color:#2b91af; font-family:Consolas <span style="font-size:x-small; color:#2b91af; font-family:Consolas <span style="font-size:x-small; color:#2b91af; font-family:Consolas SqlParameter<span style="font-size:x-small; font-family:Consolas <span style="font-size:x-small; font-family:Consolas (<span style="font-size:x-small; color:#a31515; font-family:Consolas <span style="font-size:x-small; color:#a31515; font-family:Consolas <span style="font-size:x-small; color:#a31515; font-family:Consolas "@FdNo"<span style="font-size:x-small; font-family:Consolas <span style="font-size:x-small; font-family:Consolas ,
ddlFd4.SelectedValue == <span style="font-size:x-small; color:#a31515; font-family:Consolas <span style="font-size:x-small; color:#a31515; font-family:Consolas <span style="font-size:x-small; color:#a31515; font-family:Consolas "0"<span style="font-size:x-small; font-family:Consolas <span style="font-size:x-small; font-family:Consolas
? <span style="font-size:x-small; color:#0000ff; font-family:Consolas <span style="font-size:x-small; color:#0000ff; font-family:Consolas <span style="font-size:x-small; color:#0000ff; font-family:Consolas null<span style="font-size:x-small; font-family:Consolas <span style="font-size:x-small; font-family:Consolas
:<span style="font-size:x-small; color:#2b91af; font-family:Consolas <span style="font-size:x-small; color:#2b91af; font-family:Consolas <span style="font-size:x-small; color:#2b91af; font-family:Consolas Convert<span style="font-size:x-small; font-family:Consolas

<span style="font-size:x-small; font-family:Consolas .ToInt32( ddlFund4.SelectedValue));

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