combobox with c# code (the correct way )
0
$begingroup$
i us this code and it work good with me bout what im asking for is this the good way to code it ( I use it to get data from table to link it with another combobox to make them work together).
the first combobox
public Needform()
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[Governorate]";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxGovernorate.ValueMember = "id_Governorate";
comboBoxGovernorate.DisplayMember = "name";
comboBoxGovernorate.DataSource = dt;
comboBoxCity.Enabled = false;
}
the another one
private void ComboBoxGovernorate_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBoxGovernorate.SelectedValue.ToString() != null)
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[City]where id_Governorate=@id_Governorate";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
sqlcomm.Parameters.AddWithValue("@id_Governorate", comboBoxGovernorate.SelectedValue.ToString());
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxCity.ValueMember = "id";
comboBoxCity.DisplayMember = "city";
comboBoxCity.DataSource = dt;
comboBoxCity.Enabled = true;
}
}
thx and i hope all learn from that
c#
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
0
$begingroup$
i us this code and it work good with me bout what im asking for is this the good way to code it ( I use it to get data from table to link it with another combobox to make them work together).
the first combobox
public Needform()
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[Governorate]";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxGovernorate.ValueMember = "id_Governorate";
comboBoxGovernorate.DisplayMember = "name";
comboBoxGovernorate.DataSource = dt;
comboBoxCity.Enabled = false;
}
the another one
private void ComboBoxGovernorate_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBoxGovernorate.SelectedValue.ToString() != null)
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[City]where id_Governorate=@id_Governorate";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
sqlcomm.Parameters.AddWithValue("@id_Governorate", comboBoxGovernorate.SelectedValue.ToString());
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxCity.ValueMember = "id";
comboBoxCity.DisplayMember = "city";
comboBoxCity.DataSource = dt;
comboBoxCity.Enabled = true;
}
}
thx and i hope all learn from that
c#
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
0
0
0
$begingroup$
i us this code and it work good with me bout what im asking for is this the good way to code it ( I use it to get data from table to link it with another combobox to make them work together).
the first combobox
public Needform()
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[Governorate]";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxGovernorate.ValueMember = "id_Governorate";
comboBoxGovernorate.DisplayMember = "name";
comboBoxGovernorate.DataSource = dt;
comboBoxCity.Enabled = false;
}
the another one
private void ComboBoxGovernorate_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBoxGovernorate.SelectedValue.ToString() != null)
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[City]where id_Governorate=@id_Governorate";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
sqlcomm.Parameters.AddWithValue("@id_Governorate", comboBoxGovernorate.SelectedValue.ToString());
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxCity.ValueMember = "id";
comboBoxCity.DisplayMember = "city";
comboBoxCity.DataSource = dt;
comboBoxCity.Enabled = true;
}
}
thx and i hope all learn from that
c#
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
i us this code and it work good with me bout what im asking for is this the good way to code it ( I use it to get data from table to link it with another combobox to make them work together).
the first combobox
public Needform()
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[Governorate]";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxGovernorate.ValueMember = "id_Governorate";
comboBoxGovernorate.DisplayMember = "name";
comboBoxGovernorate.DataSource = dt;
comboBoxCity.Enabled = false;
}
the another one
private void ComboBoxGovernorate_SelectedIndexChanged(object sender, EventArgs e)
{
if (comboBoxGovernorate.SelectedValue.ToString() != null)
{
string mainconn = ConfigurationManager.ConnectionStrings["MY"].ConnectionString;
SqlConnection sqlconn = new SqlConnection(mainconn);
string sqlquery = "select * from [dbo].[City]where id_Governorate=@id_Governorate";
SqlCommand sqlcomm = new SqlCommand(sqlquery, sqlconn);
sqlconn.Open();
sqlcomm.Parameters.AddWithValue("@id_Governorate", comboBoxGovernorate.SelectedValue.ToString());
SqlDataAdapter sda = new SqlDataAdapter(sqlcomm);
DataTable dt = new DataTable();
sda.Fill(dt);
comboBoxCity.ValueMember = "id";
comboBoxCity.DisplayMember = "city";
comboBoxCity.DataSource = dt;
comboBoxCity.Enabled = true;
}
}
thx and i hope all learn from that
c#
c#
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
asked 7 mins ago
Ahmed Al KhteebAhmed Al Khteeb
1
1
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ahmed Al Khteeb is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
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