private void btnRemove_Click(object sender, EventArgs e)
{
if (MessageBox.Show("Do you really want to delete this student?", "Warning", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.Yes)
{
tblStudent st = new tblStudent();
st.studentId = ID;
if (bllST.DeleteStudent(st))
{
ShowAllStudent();
}
}
}
public void GETVALUEedit(string v1, string v2, string v3, string v4)
{
txtID.Text = v1;
txtName.Text = v2;
txtClass.Text = v3;
txtScore.Text = v4;
tblStudent st = new tblStudent();
st.studentId = ID;
st.studentName = txtName.Text.Trim();
st.studentClass = txtClass.Text.Trim();
st.studentScore = txtScore.Text.Trim();
if (bllST.UpdateStudent(st))
{
ShowAllStudent();
}
}
public bool DeleteStudent(tblStudent st)
{
string sql = "DELETE tblStudent WHERE studentId = @studentId";
SqlConnection con = dc.getConnect();
try
{
cmd = new SqlCommand(sql, con);
con.Open();
cmd.Parameters.Add("@studentID", SqlDbType.NVarChar).Value = st.studentId;
cmd.ExecuteNonQuery();
con.Close();
}
catch (Exception e)
{
return(false);
}
return(true);
}
public bool UpdateStudent(tblStudent st)
{
string sql = "UPDATE tblStudent SET studentName = @studentName, studentClass = @studentClass, studentScore = @studentScore WHERE studentId = @studentId";
SqlConnection con = dc.getConnect();
try
{
cmd = new SqlCommand(sql, con);
con.Open();
cmd.Parameters.Add("@studentID", SqlDbType.NVarChar).Value = st.studentId;
cmd.Parameters.Add("@studentName", SqlDbType.NVarChar).Value = st.studentName;
cmd.Parameters.Add("@studentClass", SqlDbType.NVarChar).Value = st.studentClass;
cmd.Parameters.Add("@studentScore", SqlDbType.NVarChar).Value = st.studentScore;
cmd.ExecuteNonQuery();
con.Close();
}
catch (Exception e)
{
return(false);
}
return(true);
}
public bool InsertStudent(tblStudent st)
{
string sql = "INSERT INTO tblStudent(studentID, studentName, studentClass, studentScore) VALUES(@studentID, @studentName, @studentClass, @studentScore)";
SqlConnection con = dc.getConnect();
try
{
cmd = new SqlCommand(sql, con);
con.Open();
cmd.Parameters.Add("@studentID", SqlDbType.NVarChar).Value = st.studentId;
cmd.Parameters.Add("@studentName", SqlDbType.NVarChar).Value = st.studentName;
cmd.Parameters.Add("@studentClass", SqlDbType.NVarChar).Value = st.studentClass;
cmd.Parameters.Add("@studentScore", SqlDbType.NVarChar).Value = st.studentScore;
cmd.ExecuteNonQuery();
con.Close();
}
catch (Exception e)
{
return(false);
}
return(true);
}
public bool DeleteStudent(tblStudent st)
{
return(dalST.DeleteStudent(st));
}
public bool UpdateStudent(tblStudent st)
{
return(dalST.UpdateStudent(st));
}
public bool InsertStudent(tblStudent st)
{
return(dalST.InsertStudent(st));
}
