public bool Insert(GradesInfo grdinfo)
{
bool isSuccess = false;
//insert data to the database
//1st craete a connection between database and our application
SqlConnection conn = new SqlConnection(myconnstring);
try
{
String sql = "INSERT INTO grade (id, grades) VALUES (@id, @grades)";
SqlCommand cmd = new SqlCommand(sql, conn);
cmd.Parameters.AddWithValue("@id", grdinfo.id);
cmd.Parameters.AddWithValue("@grades", grdinfo.grades);
conn.Open();
int rows = cmd.ExecuteNonQuery();
if (rows > 0)
{
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
conn.Close();
}
return(isSuccess);
}
public bool Delete(GradesInfo grdinfo)
{
//alose declare a boole variable
bool isSuccess = false;
//sql connection
SqlConnection conn = new SqlConnection(myconnstring);
try
{
//writing query to delete data
String sql = "DELETE FROM grade WHERE id=@id";
//sql command
SqlCommand cmd = new SqlCommand(sql, conn);
//parameters
cmd.Parameters.AddWithValue("@id", grdinfo.id);
//open connection
conn.Open();
//integer variable which holds the code to execute the query
int rows = cmd.ExecuteNonQuery();
if (rows > 0)
{
//query successful
isSuccess = true;
}
else
{
//query failed
isSuccess = false;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
//close connection
conn.Close();
}
//and return this value
return(isSuccess);
}
public bool Update(GradesInfo grdinfo)
{
bool isSuccess = false;
SqlConnection conn1 = new SqlConnection(myconnstring);
try
{
string sql = " UPDATE grade SET grades=@grades WHERE id=@id ";
SqlCommand cmd = new SqlCommand(sql, conn1);
cmd.Parameters.AddWithValue("@id", grdinfo.id);
cmd.Parameters.AddWithValue("@grades", grdinfo.grades);
conn1.Open();
int rows = cmd.ExecuteNonQuery();
if (rows > 0)
{
//Successfull
isSuccess = true;
}
else
{
isSuccess = false;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
finally
{
conn1.Close();
}
return(isSuccess);
}
