how to bind column names in combobox from sql server in c#

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Hi,
I am using 3 combo boxes.
1.fist box select in table names.
2.display column names in which select table name.
3.select column name then display the all data.
i am write code for first 2 combo boxes using while loop. so old data also repeated. then please give any idea to solve this problem.

Posted 8-Apr-12 21:13pm

s v b raju

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AshishChaudha · Answer 1 · 2012-04-08T22:25:00

C#

Do like this

for binding first combo say --dropdownlist1
make sure

C#

autopostback=true

property will be true

C#

dropdownlist1.items.clear();

C#

sql="your sql query for filling table names";
//fill data into a data set say ds
<pre>dropdownlist1.datasource=ds;
dropdownlist1.datatextfield= "textfield name";
dropdownlist1.datavaluefield="value field name";
dropdownlist1.databind()

ds.clear();

for binding first combo say --dropdownlist2
make sure

C#

sql2="your sql query for filling table columname where tablename=" + dropdownlist1.selectedvalue;
<pre lang="cs">//fill data into a data set say ds1

<pre>autopostback=true

property will be true

C#

dropdownlist2.items.clear();

dropdownlist2.datasource=ds1;
dropdownlist2.datatextfield= "textfield name";
dropdownlist2.datavaluefield="value field name";
dropdownlist2.databind()

ds1.clear();

XML

for binding first combo say --dropdownlist2
make sure <pre lang="c#"><pre>autopostback=true </pre></pre>property will be true

sql3="your sql query for filling data of your column where columnname=" + dropdownlist2.selectedvalue;
<pre lang="cs">//fill data into a data set say ds2

dropdownlist3.items.clear();

dropdownlist3.datasource=ds3;
dropdownlist3.datatextfield= &quot;textfield name&quot;;
dropdownlist3.datavaluefield=&quot;value field name&quot;;
dropdownlist3.databind()</pre>

ds3.clear();

may it will help you...