'C# Invalid expression term '+='

for (int i = 0; i <= dataGridView1.Rows.Count; i++)
{
    string point_value += dataGridView1.Rows[i].Cells[1].Value + "|"; 
}

Does anyone know why I am getting this error

Invalid expression term '+='

for this code?

c++sharp


Solution 1:[1]

you create new variable with in your for loop that the reason

if you need to store data each loop you should create variable outside loop

like this

string point_value = "";
for(int i=0; i < dataGridView1.Rows.Count; i++)
    {
        point_value += dataGridView1.Rows[i].Cells[1].Value + "|"; 
    }

for more information about loop pattern here

(edited to avoid empty value and out of range from DiplomacyNotWar's commented)

Sources

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Source: Stack Overflow

Solution Source
Solution 1

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