i have a problem in bellow code

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Hi,i want to DFS(Depth first search) my graph and add the number into Queue,so i have to access the nodes in same collumn (in DataGridView3) and put them in Queue(DataGridView5),if it has seen before then update them(line **//), i have a problem in line(**//),the error is:object refrence not sent to an instance of an object.
plz help me with this problem.tnx

C#

int a = int.Parse(textBox1.Text);
int b = int.Parse(textBox2.Text);

dataGridView1.ColumnCount = a + 1;
dataGridView1.RowCount = b + 1;

dataGridView3.ColumnCount = (a * b) + 3;
dataGridView3.RowCount = (a * b) + 3;

dataGridView5.ColumnCount = (a * b) + 2;
dataGridView5.RowCount = 2;

for (int i = 0; i < dataGridView5.ColumnCount - 1; i++)
{
   for (int k = 2; k < dataGridView3.RowCount; k++)
   {
      for (int L = 2; L < dataGridView3.ColumnCount; L++)
      {
         int p = 0;

         for (int f = 0; f <= dataGridView1.RowCount - 1; f++)
         {
              if (k >= dataGridView3.RowCount)
                                break;
            dataGridView5.Rows[1].Cells[i].Value = dataGridView3.Rows[k].Cells[L + p].Value;

           
            p = p + dataGridView1.ColumnCount - 1;

            if (dataGridView5.Rows[1].Cells[i].Value != "0")
 
                   **//dataGridView5.Rows[1].Cells[i].Value=int.Parse(dataGridView5.Rows[1].Cells[i].Value.ToString()) +int.Parse( dataGridView5.Rows[1].Cells[i-1].Value.ToString());
                            
         }
      }
   }
}

Posted 2-May-14 20:49pm

nedas65

Updated 3-May-14 0:38am

José Amílcar Casimiro

v4

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DamithSL · Answer 1 · 2014-05-02T21:11:00

you have set dataGridView5.RowCount = 2; but you access 3rd row in that error line dataGridView5.Rows[2], this is zero based index, so 2nd index means 3rd item. if you need 2nd item you change it as dataGridView5.Rows[1]
next error can occur when you access dataGridView3.Rows[k], in line 15 you are increasing k value, it can be increase more than the existing rows of dataGridView3, you may need to put validation.

C#

if (k >= dataGridView3.RowCount)
 break;
dataGridView5.Rows[1].Cells[i].Value = dataGridView3.Rows[k].Cells[L + p].Value;

CHANDRA LAKHERA · Answer 2 · 2014-05-02T21:52:00

RowCount for dataGridView5 is 2, so this will have the data to the row index 0 and 1 only.

and in the line no.- 14 you are setting the value for row index 2, so it is showing error

Quote:
Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index

so check the rowindex of dataGridView5, so change the index or rowcount of dataGridView5, as your requirement.

priyankaradesilva · Answer 3 · 2014-05-02T21:36:00

hi,
i don't know what is the purpose of this code. but the error occurs due to trying access to rows and cell which not exists.

dataGridView5.Rows[2].Cells[i].Value = dataGridView3.Rows[k].Cells[L + p].Value;

here Rows[2] should be Rows[1] because datagridview5 is having 2 rows. so maximum index is 1 not 2.

and likewise datagridview3 cells and rows should not be exceed while you run your program.Carefully rewrite your program and remember the first index of a grid view is (0,0). not (1,1).

thanks. hope this would help.

i have a problem in bellow code

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