Combo box binding problem?

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there are three combo box controls and based on first combo box value data bind to combo box 2 and based on second combo box 2 value data bind to third combo box..my question is if the combination record has no value for combo box 3 and yet it is displaying value form another record and not changing until it is matched

i haven't known any solution for this problem...
please help me..

What I have tried:

internal void bindcompname()
        {
            cmd = new SqlCommand("select CompName from company",conn);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            DataRow dr = dt.NewRow();
            comboscname.DisplayMember = "CompName";
            comboscname.DataSource = dt;
            comboscname.DropDownStyle = ComboBoxStyle.DropDownList;
        }
        private void comboscname_SelectedIndexChanged_1(object sender, EventArgs e)
        {
            cmd = new SqlCommand("select model.ModNum from model inner join company on model.CompName=company.CompName where model.CompName=@cname",conn);
            cmd.Parameters.AddWithValue("@cname",comboscname.Text);
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            DataRow dr = dt.NewRow();
            combosmnumber.DisplayMember = "ModNum";
            combosmnumber.DataSource = dt;
            combosmnumber.DropDownStyle = ComboBoxStyle.DropDownList;
        }
        private void combosmnumber_SelectedIndexChanged_1(object sender, EventArgs e)
        {
            cmd = new SqlCommand("select mobile.IMEINo from mobile inner join model on model.ModId=mobile.ModId inner join company c on c.CompName=mobile.CompName where model.ModNum=@mid and mobile.Status=@sts", conn);
            cmd.Parameters.AddWithValue("@mid", combosmnumber.Text);
            cmd.Parameters.AddWithValue("@sts", "NotSold");
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            DataTable dt = new DataTable();
            da.Fill(dt);
            DataRow dr = dt.NewRow();
            combosimeinumber.DisplayMember = "IMEINo";
            combosimeinumber.DataSource = dt;
            combosimeinumber.DropDownStyle = ComboBoxStyle.DropDownList;
        }

Posted 20-Mar-18 19:49pm

sridhar babu

Updated 20-Mar-18 23:02pm

Maciej Los

v2

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Comments

Suvendu Shekhar Giri 21-Mar-18 2:02am

Can you show us the relevant code?

sridhar babu 21-Mar-18 2:24am

--a content has been moved to the question--

Maciej Los 21-Mar-18 4:57am

And what's wrong with your code?

sridhar babu 21-Mar-18 8:40am

CompName ModelNo ImeiNo
Nokia Nk109 9009090909
lenevo ln11 0000908898

my data base is like above and if i select nokia company name the the models under nokia has to bind to combo box 2 and when i select model number IMEI no has to bind to combo box 3
my problem is i has a model number in nokia and no IMEI no but when i select that record it is showing the IMEI no of other model other than showing Empty
i hope you understand my problem
please ping me for clarity...
thank you

2 solutions

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Maciej Los · Answer 1 · 2018-03-20T23:03:00

Solution 2

Check this:
Cascading ComboBox in Windows Forms (WinForms) application using C# .Net[^]
Cascading ComboBox In Winforms Windows Forms C# VB.NET[^]

Posted 20-Mar-18 23:03pm

Maciej Los

Comments

sridhar babu 21-Mar-18 8:41am

not worked

Maciej Los 21-Mar-18 8:43am

:laugh:

sridhar babu · Answer 2 · 2018-03-20T20:22:00

Quote:
internal void bindcompname()
{
cmd = new SqlCommand("select CompName from company",conn);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
DataRow dr = dt.NewRow();
comboscname.DisplayMember = "CompName";
comboscname.DataSource = dt;
comboscname.DropDownStyle = ComboBoxStyle.DropDownList;
}
private void comboscname_SelectedIndexChanged_1(object sender, EventArgs e)
{
cmd = new SqlCommand("select model.ModNum from model inner join company on model.CompName=company.CompName where model.CompName=@cname",conn);
cmd.Parameters.AddWithValue("@cname",comboscname.Text);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
DataRow dr = dt.NewRow();
combosmnumber.DisplayMember = "ModNum";
combosmnumber.DataSource = dt;
combosmnumber.DropDownStyle = ComboBoxStyle.DropDownList;
}
private void combosmnumber_SelectedIndexChanged_1(object sender, EventArgs e)
{
cmd = new SqlCommand("select mobile.IMEINo from mobile inner join model on model.ModId=mobile.ModId inner join company c on c.CompName=mobile.CompName where model.ModNum=@mid and mobile.Status=@sts", conn);
cmd.Parameters.AddWithValue("@mid", combosmnumber.Text);
cmd.Parameters.AddWithValue("@sts", "NotSold");
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataTable dt = new DataTable();
da.Fill(dt);
DataRow dr = dt.NewRow();
combosimeinumber.DisplayMember = "IMEINo";
combosimeinumber.DataSource = dt;
combosimeinumber.DropDownStyle = ComboBoxStyle.DropDownList;
}