Vendor name need not to be repeated while inserting in to the database

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I am inserting the record in grid view. when VendorFName, VendorLName,VendorCity,VendorState,VendorCountry,VendorDescription all the datas are recorded.

then i am inserting the second record suppose when i repeat the VendorFName and press add new button i want to show the message VendorFName is already exists please enter different name.

for that how to write the code in asp.net with C#.

i send my code as follows;
from my code how to write the code for vendrofname already exists.

C#

protected void ResultGridView_RowCommand(object sender, GridViewCommandEventArgs e)
    {
        if (e.CommandName.Equals("AddNew"))
        {
            TextBox txtFName = (TextBox)ResultGridView.FooterRow.FindControl("txtFName1");
            TextBox txtLName = (TextBox)ResultGridView.FooterRow.FindControl("txtLName1");
            TextBox txtCity = (TextBox)ResultGridView.FooterRow.FindControl("txtCity1");
            TextBox txtState = (TextBox)ResultGridView.FooterRow.FindControl("txtState1");
            TextBox txtCountry = (TextBox)ResultGridView.FooterRow.FindControl("txtCountry1");
            TextBox txtDescription = (TextBox)ResultGridView.FooterRow.FindControl("txtDescription1");
            SqlConnection conn = new SqlConnection("Server=(local);initial catalog=master;Trusted_Connection=True");
                cmd.Connection = conn;
                cmd.CommandText = "INSERT INTO Vendors(VendorFName, VendorLName,VendorCity,VendorState,VendorCountry,VendorDescription) Values('" + txtFName.Text + "', '" + txtLName.Text + "', '" + txtCity.Text + "', '" + txtState.Text + "', '" + txtCountry.Text + "' , '" + txtDescription.Text + "')";
                conn.Open();
                cmd.ExecuteNonQuery();
                FillVendorGrid();
                conn.Close();
            
        }
    }

Posted 4-Dec-12 19:45pm

Member 8054539

Updated 4-Dec-12 20:36pm

André Kraak

v2

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3 solutions

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choudhary.sumit · Answer 1 · 2012-12-04T19:53:00

Solution 1

C#

SqlDataReader dr=new SqlDataReader("select * from table where VendorFName ='"+ txtFName.Text+"'",conn);
if(dr.read())
{
dr.Close();
Messagebox.Show("Already exist");
}
else
{
dr.close();
// go for your insert  code.
}

Posted 4-Dec-12 19:53pm

choudhary.sumit

azizulhoque.bd · Answer 2 · 2012-12-04T20:09:00

Hi dear,

check this solution.

protected void ResultGridView_RowCommand(object sender, GridViewCommandEventArgs e)
{
  if (e.CommandName.Equals("AddNew"))
  {
     string SQLExists = "select * from table where VendorFName ='"+ txtFName.Text+"'";
     SqlCommand cmd = new SqlCommand (SQLExists,conn ); 
     SqlDataAdapter da = new SqlDataAdapter(cmd ); 
     DataTable dt = new DataTable();
     da.Fill(dt);
     if(dt.Rows.Count > 0)
     {
        Messagebox.Show("Vendor FName Already exist");
        return;
     }

  else
  {
    TextBox txtFName = (TextBox)ResultGridView.FooterRow.FindControl("txtFName1");
    TextBox txtLName = (TextBox)ResultGridView.FooterRow.FindControl("txtLName1");
    TextBox txtCity = (TextBox)ResultGridView.FooterRow.FindControl("txtCity1");
    TextBox txtState = (TextBox)ResultGridView.FooterRow.FindControl("txtState1");
    TextBox txtCountry = (TextBox)ResultGridView.FooterRow.FindControl("txtCountry1");
    TextBox txtDescription =  (TextBox)ResultGridView.FooterRow.FindControl("txtDescription1");
    SqlConnection conn = new SqlConnection("Server=(local);initial catalog=master;   Trusted_Connection=True");
    cmd.Connection = conn;
   cmd.CommandText = "INSERT INTO Vendors(VendorFName,   VendorLName, VendorCity, VendorState, VendorCountry, VendorDescription)     Values('" + txtFName.Text + "', '" + txtLName.Text + "', '" + txtCity.Text + "', '" + txtState.Text + "', '" + txtCountry.Text + "' , '" + txtDescription.Text + "')";
    conn.Open();
    cmd.ExecuteNonQuery();
    FillVendorGrid();
    conn.Close();

  }
}

manu g m · Answer 3 · 2012-12-04T20:25:00

you can use linq

C#

int rowIndex = -1;

        DataGridViewRow row = dgv.Rows
            .Cast<DataGridViewRow>()
            .Where(r =>r.Cells["SystemId"].Value.ToString().Equals(searchValue))
            .First();

        rowIndex = row.Index;

if(rowindex >1 )
   Message.Box("Message");

Or

C#

foreach(DataGridViewRow dgvRow in ResultGridView.Rows)
{
     if(row.Cells["columnname"].Value.ToString().Equals(searchValue))
     {
            Message.Box("Message");
     }
}

Vendor name need not to be repeated while inserting in to the database

3 solutions

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