C#- OleDb Data Adapter

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Hi.

This is my program.

try
{
con.open();
{
da=new oledbdataadapter("Select modelname from table where type='gate' and min<='"+textbox1.text+"' and max>=textbox1.text+"'",con);
ds.Fill(da,"main");
if(tables[0].rows.count>1)
{
datagridview1.datasource=ds;
datagridview1.datamember=main;
}
else
{
datagridview1.datasource=null;
}

Here i given min and max range for every model.If i give any number in textbox1 , it should compare the values between min and max range and gives the result..

For example;

Model Name : zeta,
min=200
max=250
type=gate

If i give 210, it should give respective model name which have comes in that range.

but it displays all fields which have 2,1,0,21,20,210,10.

please help me for this issue.

Posted 24-Sep-13 22:05pm

Member 10295714

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Rick van Woudenberg · Answer 1 · 2013-09-24T22:25:00

Hi there,

This behaviour could be caused because you're asking the database to return an integer value (the return value min/max from the database) based on a string (text) input. You could try to parse the textbox value to an integer like :

C#

int i = Convert.ToInt32(textbox1.Text.Trim());

and then feed that value to the database using an sql query (mind the quotes) :

C#

da=new oledbdataadapter("Select modelname from table where type='gate' and min <= i and max >= i",con);

also I notice a typo in your original query, not sure if that's a copy/paste issue but it will certainly return an inproper value if you use it like that. You forgot a couple of quotes :

da = new oledbdataadapter("SELECT modelname FROM table WHERE type='gate' AND min <= '" + textbox1.text + "' AND max >= '" + textbox1.text + "'",con);

The inaccurate use of quotes is responsible for 90% of invalid results of database queries or database query failures. Hope this helps