c# - Difference between (long)value and Convert.ToInt64(value) -

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i've procedure gets value database dataset , copy local long typed variable. contains long value.

this how i'm copying value dataset variable.

areaid = dstable.searchedtable[i].isareaidnull() ? 0 : (long)dstable.searchedtable[i]["areaid"];

sometimes works fine gives me error

specific cast not valid

then have change these kind of conversion format

 areaid = dstable.searchedtable[i].isareaidnull() ? 0 : convert.toint64(dstable.searchedtable[i]["areaid"]);

i'm confused what's wrong (long) when has same value both methods , 65. i'm missing on here??


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