# how can I use warm start in C#

I have been working on a MIP in C#. I want to reduce the gap, so I'm trying warm start. I use this code just before solve().

try
{
startvar = new IIntVar[numberOfAllNode * numberOfAllNode];
startval = new double[numberOfAllNode * numberOfAllNode];

for (int j = 1, idx = 0; j <= numberOfAllNode; j++)
for (int i = 1; i <= numberOfAllNode; i++)
{
startvar[idx] = x[j][i];
startval[idx] = x_value[j,i];
idx++;
}

startvar = null;
startval = null;

I got some syntax errors in the last line. unfortunately, I don't know what variable should I write in startvar[]. I'll be grateful if anyone can help me with this one.
1. Don't set startvar and startval to null before calling AddMIPStart.
2. Remove square brackets from startvar and startval in the cal to AddMIPStart.