C# .Net combobox selected item used as Input of a sql SP

Akash please once follow below process:

 

(01.) First create 3 different methods to execute your 3 different storedprocedures with your required i/p with return type is data reader. And on your form load bind your all 3 comtrols like-

combobox1 , combobox2 and dataGridView1.

 

(02.) On combobox1 SelectedIndexChanged event rebind your combobox2. Pass combobox1 selected value as input to the storedprocedure through your method which you are using to bind combobox2.

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)

{

      // Rebind  combobox2

}

 

(03.) On Checkbox1 CheckedChanged evevt bind your DataGridView1.

private void checkBox1_CheckedChanged(object sender, EventArgs e)

{

      // Renind  dataGridView1

}

 

 

 

If this is helpful for you then please accept my Answer.