Assign dataGridView cell value to variable

[hydro123]

I am using VC++2008 and am trying to read data enetered in unbound datagridview to implement in function. Under button_click event I entered the following:

// initialize varaibles from dataGridView
double C1;
double INF1;
double T1;
 
//Read String values from each dataGridView Cell
String^C1s = safe_cast<String^>(dataGridView1[0,0]->Value);
String^INF1s = safe_cast<String^>(dataGridView1[0,1]->Value); 
String^T1s = safe_cast<String^>(dataGridView1[0,2]->Value); 
 
//Convert from String Value to Double 
C1 = Convert::ToDouble(C1s);
INF1 = Convert::ToDouble(INF1s);
T1 = Convert::ToDouble(T1s);
 

The variables are used in a function. Everything compiles fine but when I enter values on first row of datagridview and hit button I get

"An unhandled exception of type 'System.Argumen tOutOfRangeExce ption' occurred in mscorlib.dll Additional information: Index was out of range. Must be non-negative and less than the size of the collection."

I have added following code to form to restrict number of rows as defined in numericupdown box

private: System::Void dataGridView1_RowEnter(System::Object^  sender, System::Windows::Forms::DataGridViewCellEventArgs^  e)     //raises event handler 
 
{    
  int NUMST;
  NUMST = safe_cast<int>(this->numericUpDown1->Value); //Input from numericUpDown box
  if (this->dataGridView1->RowCount > NUMST) 
         this->dataGridView1->AllowUserToAddRows = false; 
}
 

The number of rows is restricted ok, but I believe that once the AllowUserToAddR ows = false the RowIndex is set to -1 and its throwing the out of range error.

Would anybody have a suggestion on how to make this work, or is there a better way to read data from unboubnd datagrid and assign each cell to double numeric variable to be used in function? Thank you.