i am try to update string into integer from database

char[] section = new char[6];

section[0] = '0';

section[1] = 'A';

section[2] = 'B';

section[3] = 'C';

section[4] = 'D';

section[5] = 'E';

for (int i = 0; i < dataGridView1.Rows.Count; i++)

{

int a;

try

{

a = int.Parse(dataGridView1.Rows[i].Cells["dgvcsection"].Value.ToString());

}

catch

{

a = 0;

}

for (int j = 0; j <= a; j++)

{

//Data.InitConnection();

char b = section[j];

SqlCommand cmd = new SqlCommand("SPClass", Data.connection);

cmd.CommandType = CommandType.StoredProcedure;

cmd.Parameters.AddWithValue("ClassID", 0);

cmd.Parameters.AddWithValue("Standard", dataGridView1.Rows[i].Cells["dgvcstandard"].Value.ToString());

cmd.Parameters.AddWithValue("Section", b.ToString());

cmd.Parameters.AddWithValue("pindex", i + 1);

cmd.Parameters.AddWithValue("cindex", j);

cmd.Parameters.AddWithValue("Batch", textBox1.Text);

cmd.Parameters.AddWithValue("@created_ by", Mashupdata.EmployeeID);

cmd.Parameters.AddWithValue("@created_date", "0");

cmd.Parameters.AddWithValue("@modified_by", Mashupdata.EmployeeID);

cmd.Parameters.AddWithValue("@modified_date", "0");

cmd.Parameters.AddWithValue("@ext", "0");

cmd.ExecuteNonQuery();

MessageBox.Show("class allotted successfully");

}

} Data.CloseConnection();

}

catch(Exception ex)

{

Utility.ErrorLog.WriteToFile(Mashupdata.errorFile, "FrmClassAllotment:button1_Click", ex.Message);

}